Testoval Phosphate Color Comparison Device – Manual Measurement Replacement color comparison device for quick and easy determination of phosphate in water The Testoval Phosphate Color Comparison Device is designed for fast visual determination of phosphate content in water. Measurement is performed manually via color comparison. Without the use of additional electronic equipment, concentrations from 0.25 mg/L to 10 mg/L P₂O₅ can be read directly using the color scale. The Heyl Testoval is suitable for both routine checks and simple documentation of results. Fast Phosphate Measurement via Color Comparison Without Equipment The Heyl color comparison device is specifically designed for applications requiring fast results and ease of use. By diluting the water sample 1:10 with distilled water, the measurement range can be extended tenfold. With the Testoval Phosphate Color Comparison Device, approximately 180 analyses can be performed, making it an economical solution for routine monitoring. Typical Applications of the Phosphate Color Comparison Device Manual phosphate determination is a proven method in many areas of water analysis, particularly where electronic measurement devices are unavailable or unnecessary. Environmental monitoring Water and wastewater analysis Laboratory applications Advantages of Phosphate Measurement with the Heyl Testoval Kit The Heyl Testoval Phosphate Test Kit offers a reliable, fast, and user-friendly way to determine phosphate content (P₂O₅) in water samples—completely without electronic devices or lab infrastructure. Fast on-site results: The colorimetric measurement provides usable results within minutes, ideal for routine checks, spot measurements, and immediate decisions. Easy handling without equipment: No electronic devices, power supply, or software are needed. Results are read visually via a color scale, making the device robust, error-tolerant, and easy to use. High practicality and mobility: Compact design allows mobile use—in the field, at measurement points, or in operational settings. Perfect where laboratory analysis would be too complex or time-delayed. Accuracy for monitoring and control: Provides practical accuracy for environmental monitoring, water and wastewater analysis, and brewing, allowing limits to be checked and trends detected early. Economical and efficient: With around 180 analyses per kit, the Heyl Testoval offers a cost-effective solution for regular measurements without maintenance, calibration, or follow-up costs for equipment. Extendable measurement range: Simple sample dilution (1:10) allows flexible expansion of the measurement range, increasing usability for higher phosphate concentrations.

The Testoval Nitrite Test Kit is an analysis kit that allows you to determine the nitrite content in water visually by comparing colours. Simple nitrite test for your water samples With the Testoval Nitrite Test Kit, the nitrite content in water can be tested easily and visually. Water is poured into a cuvette of the test kit, the reagents are added, and the colour change in the water is then observed. The individual values of 0.05 mg/l, 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l and 1 mg/l can be read by visual colour comparison. By diluting the water sample in a ratio of 1:10 with distilled water, the measurement range can be extended to 10 times the concentration. This method is particularly suitable for quick on-site checks, e.g. in swimming pools, fountains or technical installations. Features of the test kit? The test kit allows you to determine the nitrite content in water without technical measuring equipment or electricity. It provides a measurement result within approximately 15 minutes. With one test kit, you can carry out approximately 100 analyses.

Testoval® pH Chlor DPD Test Kit – Color Comparison for pH and Chlorine Quick and reliable determination of pH value and free and total chlorine in water The Testoval pH-Chlor DPD Test Kit is designed for rapid manual analysis of pH and chlorine. The pH measurement range is 6.8–8.0, while the chlorine content is measured in the range of 0–1 mg/L. The values pH 6.8, 7.4, and 8.0 as well as 0.1 mg/L, 0.5 mg/L, and 1.0 mg/L chlorine can be read safely using optical color comparison. Original Heyl Test Kit for Rapid Determination of pH and Chlorine The Testoval® pH-Chlor DPD Test Kit from Heyl is an original color comparison kit for rapid manual analysis of pH and both free and combined (total) chlorine in water. It was specifically developed for the requirements of swimming pool water monitoring. Advantages of the Original Testoval® pH-Chlor DPD Test Kit The Testoval® pH-Chlor DPD Test Kit combines two important water parameters in one set (pH and chlorine), enabling particularly efficient water analysis. With a measurement time of approximately 3 minutes per test, around 70 measurements can be performed – ideal for routine monitoring during operation. As an original Heyl product, the test kit ensures high measurement reliability, reproducible results, and maximum reagent compatibility. It helps operators maintain stable water quality, control disinfection processes, and reliably meet hygienic standards. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Testoval pH Range 5.5 to 8 Test Kit The test kit covers a measuring range from pH 5.5 to pH 8 and allows easy reading of values via defined color levels. No electronic device is required when performing measurements with the test kit. The Testoval pH range 5.5 to 8 test kit from Heyl is a colorimetric color comparison set for fast and manual determination of pH value in water. It is particularly suitable for routine analyses where simple and reliable control without electronic measuring devices is required. By adding the included reagents, a characteristic color change of the water sample occurs. This is then visually compared with reference values using the color comparator. In this way, the pH value can be determined quickly and reliably. Scope of delivery of the test kit from Heyl The test kit contains all components required to carry out the analysis. These include reagents for the pH measurement reaction, the color comparator for visual evaluation, as well as measuring tubes, a measuring spoon, and a cuvette. This makes the test kit ready for immediate use and suitable for both stationary and mobile applications. Advantages of the Testoval pH test kit with measuring range 5.5 to 8 Thanks to the simple application via optical color comparison, fast manual determination of pH value in water is possible. No electronic measuring devices or power supply are required to operate the test kit. The test kit delivers reliable and precise results within a very short time. Application areas of the pH test kit from Heyl The Testoval pH test kit is suitable for various areas of water analysis, such as monitoring drinking and process water, supervising water treatment systems, routine checks in industry and laboratories, as well as quality control in environmental and process analysis. Technical Data Measuring range: pH 5.5 – 8 Readable values: 5.5 / 6 / 6.5 / 7 / 7.5 / 8 Number of analyses: approx. 250 Measurement time: approx. 1 minute Measurement principle: colorimetric color comparison Matching products such as the refill pack and replacement color comparator are also available in our shop: Item number: 410611 Testoval pH Range 5.5 to 8 - Reagents Refill Pack enables an additional 250 analyses Item number: 410612 Replacement Color Comparator

Testoval pH Range 8 to 12 Test Kit The Testoval pH test kit from Heyl with a measuring range of 8–12 is ready for immediate use and is suitable for both stationary and mobile applications. With the help of the color comparator, the values can be read quickly and easily. The Testoval pH range 8 to 12 test kit is a colorimetric color comparison set for fast manual determination of pH value in the alkaline range. It is ideal for applications where simple and reliable pH control is required without electronic measuring devices. By adding the included reagents, the water sample changes color according to its pH value. This color is then compared with reference values using the integrated color comparator, allowing the pH value to be determined quickly and visually. Your advantages with the Testoval pH range 8–12 test kit from Heyl Thanks to its compact and handy design, quick and easy determination of pH values in the alkaline range is possible. The test kit delivers reliable results through defined reference colors and is suitable for both mobile and on-site applications. Possible application areas of the test kit from Heyl The Testoval pH range 8–12 test kit is versatile and can be used in areas such as monitoring pH values in process and industrial wastewater, supervising water treatment systems, routine laboratory checks, and quality control. Technical Data Measuring range: pH 8 – 12 Readable values: 8 / 8.5 / 9 / 9.5 / 10 / 10.5 / 11 / 11.5 / 12 Number of analyses: approx. 200 Measurement time: approx. 1 minute Measurement principle: colorimetric color comparison Matching spare parts for the test kit are also available in our online shop: Item number 410617: Testoval pH range 8 to 12 reagents refill pack – reagents for additional analyses Item number 400618: Replacement color comparator pH 8–12 – replacement device for optical evaluation

Heyl Testoval Phosphate Test Kit – Measure Phosphate Quickly by Hand Colorimetric test kit for easy determination of phosphate (P₂O₅) in water The Heyl Testoval Phosphate Test Kit allows simple and reliable determination of phosphate content (P₂O₅) in water samples. Measurement is performed colorimetrically via a visual color comparison and covers a range of 0 to 10 mg/L. The kit is a practical color comparison set for manual analysis of phosphate in water samples. The color develops within minutes after adding the reagents. By diluting the water sample 1:10 with distilled water, the measurement range can be extended tenfold. The kit allows for approximately 180 analyses in total. Fast Phosphate Analysis in Water Using Color Comparison The colorimetric method enables rapid determination of phosphate without complex equipment. After adding the reagents, the resulting color intensity is compared with a reference scale, allowing direct reading of the phosphate level. Due to its simplicity, the kit is ideal for routine checks, spot measurements, and applications where fast and reliable results are required. Typical Applications of the Phosphate Test Kit Manual phosphate determination is important in many areas of water analysis, particularly where nutrient levels must be monitored. Breweries Environmental monitoring Advantages of Phosphate Measurement with a Heyl Test Kit The Heyl Test Kit provides a simple, fast, and cost-effective way to measure phosphate content in water samples without the need for electronic devices or laboratory infrastructure. The colorimetric method delivers meaningful results within minutes. The main advantage: immediate results, allowing on-site assessment of whether phosphate levels are within acceptable limits, enabling quick response when needed. This is particularly useful for routine checks, spot measurements, or emergency testing. Easy handling: No special training or equipment required Mobility: Ideal for field measurements and decentralized applications Low cost: No purchase or maintenance of electronic devices needed Reliability: Proven method for reproducible results Flexibility: Can be used where no electricity or lab is available Why Phosphate Measurement Is Essential Phosphate is a key nutrient in water, but high concentrations can cause significant ecological and technical problems. Even small excesses can lead to algae growth, oxygen depletion, and deteriorating water quality. Regular phosphate monitoring is critical for: Environmental monitoring: Protect water bodies from over-fertilization Water treatment: Ensure compliance with legal limits Industry & breweries: Maintain stable process and product quality Wastewater management: Monitor the performance of treatment plants The Heyl Phosphate Test Kit enables fast, reliable, and lab-independent monitoring on site, allowing early trend detection and targeted interventions.

Reliable manual determination of dissolved silicate in water Testoval Silicate Test Kit – color comparison for fast analysis The Testoval silicate test kit can be used in many areas, including the early detection of silicate deposits in systems. Silicate can lead to stubborn deposits and reduce the efficiency of systems, which is why regular monitoring is recommended. With the Testoval silicate test kit, the content of dissolved silicate in water can be determined easily and directly on site. The set works according to the principle of visual color comparison and is ideal for applications where fast and traceable results are required without complex measuring technology. It is suitable for the fast, manual analysis of silicate content in water in the concentration range of 0–10 mg/l SiO₂. The individual values 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l and 10 mg/l can be read by optical color comparison. After adding the reagents, the water sample reacts with a characteristic color development. This is then compared with the reference values of the color comparator, allowing the silicate concentration to be reliably estimated. Manual determination of dissolved silicates in water up to 10 mg/l By diluting the sample in a ratio of 1:10, the measurable range can be extended by a factor of 10. With the test kit, approximately 100 individual analyses can be performed. The analysis time is approx. 19 minutes per measurement. Your advantages with the Testoval silicate test kit The Testoval silicate test kit is ideal for the direct determination of dissolved silicate in water. It uses a visual measurement method, meaning no electrical device is required for measurement. The color comparator provides clear gradations for fast reading of values. The test kit is ideal for regular on-site and mobile checks. Application areas of the silicate test kit The test kit can be used in many different areas such as monitoring boiler feed water and steam systems, checking cooling and process water, use in reverse osmosis and treatment systems, as well as routine analyses in laboratories or technical service. The test kit can be used for early detection of deposits and system issues. Why is monitoring silicate in water so important? Dissolved silicates play a crucial role in industrial water treatment, especially in boiler feed water, cooling water, and reverse osmosis systems. Excessive silicate concentrations can lead to the formation of stubborn deposits (silicate scaling), which are difficult to remove and can significantly impair heat transfer and system efficiency. In membrane processes, silicate can also cause irreversible damage and significantly shorten membrane lifespan. Regular monitoring of silicate levels allows early detection of limit values, targeted control of treatment processes, and prevention of costly system damage. The Testoval silicate test kit therefore supports safe process control and long-term operational reliability. Technical Data Measurement parameter: silicate (SiO₂, dissolved) Measuring range: 0–10 mg/l SiO₂ Readable values: 0.25 / 0.5 / 1 / 2.5 / 5 / 10 mg/l Number of analyses: approx. 100 Measurement time: approx. 19 minutes Measurement principle: colorimetric color comparison Additional products available in our online shop Item number: 410623 Testoval silicate reagents refill pack – for approx. 100 additional analyses Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Color comparison test kit TESTOVAL Sulfite for the concentration range 0–20 mg/l SO32-. The sulfite test kit is suitable for many application areas, including the control of oxygen scavengers (sulfite dosing). Regular monitoring helps to prevent corrosion in systems. For fast monitoring of sulfite in water, the Testoval sulfite test kit offers a practical solution without complex measuring technology. The set works with an optical color comparison and enables direct evaluation of the water sample – ideal for applications where ease of use and fast results are essential. After adding the reagents, a color reaction develops. This is compared with stored reference values in the color comparator, allowing the concentration to be determined reliably. The measuring range is 0–20 mg/l SO₃²⁻ and covers typical requirements in water monitoring. The individual values 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l, 10 mg/l and 20 mg/l can be read by optical color comparison. The scope of delivery includes two reagents as well as a color comparator for simple concentration determination. Advantages of the Heyl test kit for sulfite measurement The test kit offers a convenient solution for fast and simple sulfite determination on-site and on the go. It uses a visual measurement method, so no power supply is required. The color comparator allows easy and quick evaluation of reliable results thanks to its clear gradation. Possible application areas The test kit is suitable for various applications and is particularly relevant in areas where sulfite-related corrosion may occur. These include monitoring boiler feed water and steam systems, controlling oxygen scavengers (sulfite dosing), and use in cooling and process water systems. Technical Data Measurement parameter: sulfite (SO₃²⁻) Measuring range: 0–20 mg/l Readable values: 0.5 / 1 / 2.5 / 5 / 10 / 20 mg/l Number of analyses: approx. 150 Measurement time: approx. 3 minutes Measurement principle: colorimetric color comparison Additional products also available in our shop Item number: 410635 Testoval sulfite reagents refill pack – for approx. 150 additional analyses Item number: 410636 Replacement color comparator sulfite – for optical evaluation

Replacement colour comparison kit (without cuvette), for rapid manual analysis of the aluminium content in water in the concentration range 0 to 1.5 mg/l Al. The Testoval Aluminium Colour Comparison Device is an analytical instrument that allows the aluminium content in water to be determined directly by colour comparison. To do this, place a water sample in a measuring tube and add the reagents. Then pour the liquid into a cuvette and insert it into the colour comparison device. After about six minutes, the water sample changes colour, which is then compared with the device’s colour scale. The individual values of 0 mg/l, 0.1 mg/l, 0.2 mg/l, 0.5 mg/l, 1 mg/l and 1.5 mg/l can be read off the colour comparison device by visual comparison. How does the colour comparison device work? The colour comparison device is part of the Testoval system. You take a defined water sample, add the appropriate reagents and observe the colour reaction. You then compare the resulting colour with the scale in the device to read the aluminium value. This method allows for quick and direct monitoring without the need for other measuring instruments. Features and benefits at a glance Used for simple manual determination of the aluminium content in water Supplied with an integrated colour scale that allows direct reading Practical for mobile testing and ad hoc checks Can be equipped with appropriate reagents as required

Chloride Color Comparator Testoval from Heyl Replacement color comparator Testoval Chloride without cuvette, for fast manual analysis of chloride content in water in the concentration range of 0–100 mg/l Cl. The Testoval color comparator for chloride is an analysis device for the visual determination of chloride concentration in water samples. It is used in combination with the appropriate reagents and enables quick and easy evaluation via optical color comparison. After the chemical reaction of the water sample with the reagents, a characteristic color change occurs. This is compared with an integrated color scale in the comparator, allowing the chloride content to be reliably determined. The device is suitable as a replacement or additional unit for the Testoval Chloride test kit and supports manual analyses without electronic measuring systems. Technical Data of the Chloride Color Comparator Testoval from Heyl Number of analyses: approx. 40 The individual values 1 mg/l, 5 mg/l, 10 mg/l, 25 mg/l, 50 mg/l and 100 mg/l can be read by optical color comparison. Measurement time: approx. 3 minutes Advantages of the Heyl Color Comparator simple determination of chloride content through visual color comparison clear color scale for fast evaluation suitable as a replacement device for the existing Testoval Chloride test kit enables fast routine analyses of water samples Possible Application Areas drinking water analysis industrial and environmental analytics control of chloride levels in technical water systems laboratory analyses and quality control The scope of delivery includes only a color comparator for simple concentration determination. A set of reagents for approx. 40 analyses or a complete kit can be ordered separately. Also Available in Our Shop Item number: 410526 Testoval Chloride Test Kit Item number: 410527 Testoval Chloride Reagents Refill Pack

Testoval Nitrite Colour Comparison Kit or Replacement Colour Comparison Kit (without cuvette), for rapid manual analysis of the nitrite content in water within the concentration range 0–1 mg/l NO₂. The Testoval Nitrite Colour Comparison Device is the ideal measuring instrument for nitrite tests using reagents. It allows water samples to be analysed quickly and clearly by comparing the resulting colour directly with a scale. Precise analysis of the nitrite test The nitrite colour comparison device is designed to reliably read the colour reaction of a water sample. Once the water has been mixed with the reagents, a specific colour appears, and it is precisely this colour that can be compared with the integrated scale. This allows the nitrite content in the water to be reliably determined. Suitable for Testoval reagents and test kits The colour comparison device is specifically designed for the Testoval system and only works in conjunction with the appropriate reagents and test kits. It is an essential part of the measurement process, helping to ensure the results are read correctly.

Testoval Color Comparator for pH Range 8–12 The Testoval color comparator for pH measurement in the alkaline range is ideal as a replacement or addition for existing test kits from Heyl. It is particularly practical for mobile use or regular control measurements. The Testoval color comparator for the pH range 8–12 is used for the visual evaluation of water samples in the alkaline range. It is specifically designed for use with the corresponding Testoval reagents from Heyl and enables easy determination of the pH value through direct color comparison. After the reaction of the water sample with the reagents, a characteristic coloration occurs. This is compared with the integrated reference colors in the device, allowing the pH value to be determined quickly and without electronic aids. Your advantages with the color comparator from Heyl for pH measurement Thanks to the well-designed construction of the color comparator, the pH value can be determined quickly and easily through visual color comparison. No complex training is required to use the product. The application is completely independent of power supply or electronic measuring devices. Due to its compact design, the device is suitable for both laboratory use and mobile applications. The color comparator is the original replacement device for the Testoval test kit from Heyl for the pH range 8–12. Please note that reagents, cuvettes, and additional accessories are not included in the scope of delivery. Additional products available in our online shop Item number 410616: Testoval pH range 8–12 test kit – complete set for pH analysis Item number 410617: Testoval pH range 8–12 reagents refill pack – for additional analyses

Water Hardness DUO Titration Kit – Flexible Hardness Analysis For precise measurement of water hardness The Water Hardness DUO Titration Kit is designed to measure water hardness in raw water (30–80 °dH) and treated water (0–2 °dH). With the DUO kit, you can reliably determine the hardness of both raw and treated water. The set includes all necessary reagents and accessories for immediate use. Precise Determination of Water Hardness in Raw and Treated Water The Water Hardness DUO Titration Kit provides a flexible and reliable analysis of water hardness for both raw and treated water. It covers a wide measurement range from 30–80 °dH in raw water and 0–2 °dH in treated water, making it ideal for various applications in water treatment. The kit is designed for users who require fast and accurate hardness measurements, whether for untreated raw water or softened water. Advantages of the Water Hardness DUO Titration Kit With the DUO titration kit, two measurement ranges can be covered with a single set. This reduces the need for separate measurement systems and allows efficient monitoring of water hardness before and after treatment. The set includes all necessary reagents and accessories for immediate use. The manual titration method delivers precise and reproducible results and is particularly suitable for control measurements, commissioning, or mobile applications in water analysis. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.