The transparent replacement cuvette is a spare part suitable for all Testoval kits from Heyl. Replacement Cuvette for Testoval Test Kits from Heyl The replacement cuvette is a measuring vessel made of transparent material that serves as a sample container in chemical analyses. It is particularly used for manual test kits where a defined quantity of a water sample or reagent is required, for example in colorimetric analyses or titrations. Why buy the replacement cuvette from Heyl? Precisely fitting for all TESTOVAL test kits from Heyl Transparent design Reusable Cost-effective replacement Possible applications of the cuvette The cuvette can be used together with manual water analysis test kits, especially the Heyl Testoval kits. It is used wherever a defined and repeatable sample intake is required, e.g. for color comparison reactions or photometric measurements in handheld test devices. (except Testoval Chloride, item no.: 410529)

Replacement Cuvette Chloride for Testoval Chloride Test Kit The replacement cuvette is suitable for the Testoval Chloride color comparison test kit. Thanks to the cuvette, all measurement results are reproducible, whether measurements are carried out in the laboratory or on-site. The replacement cuvette for chloride is a precise measuring vessel for the Testoval Chloride test kit. Its design ensures that all results are accurate and reproducible. The cuvette is made of high-quality, chemically resistant material, making it suitable even for aggressive reagents. It is compatible with the Testoval Chloride test kit and can be used as a replacement part if original cuvettes are damaged or lost. Advantages of the Heyl Replacement Cuvette for the Testoval Chloride Color Comparison Test Kit perfect fit for Testoval Chloride test kits durable and reusable with proper cleaning optimal reproducibility of measurement results transparent design for precise visual inspection The chloride cuvette is only suitable for the Testoval Chloride test kit. Due to exact volume, optical path, and material, it provides precise results; other cuvettes are not compatible.

Replacement color comparator without cuvette, for the Testoval Chlorine DPD color comparison kit for the concentration range 0.1–1 mg/l free and total chlorine. The three reagents are not included in the scope of delivery and can be ordered separately or as part of a complete set. Chlorine DPD 0.1–1 mg/l - Color Comparator Testoval – Values by color comparison The Testoval color comparator for Chlorine DPD (0.1–1 mg/l) is a replacement color comparator for the Testoval chlorine test kit from Heyl. It is used to determine free and total chlorine in water by means of an optical color comparison. The device is specifically designed for the measuring range of 0.1 to 1 mg/l chlorine and serves as a replacement part for the corresponding Testoval test kit. The reagents are not included in the scope of delivery and must be ordered separately. Technical data: Analyses: approx. 70 Measurement time: approx. 1 minute The individual values 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l, 0.75 mg/l and 1 mg/l can be read by optical color comparison. Possible applications Drinking water and process water analyses Monitoring of disinfection processes Routine analyses in laboratories Service and maintenance operations in water systems Why should you order the color comparator from Heyl? Fast determination of chlorine content through optical color comparison Specifically designed for Testoval Chlorine DPD 0.1–1 mg/l test kits Clear color scale for quick concentration determination You can also order the test kit complete or as a refill pack: Item number: 410521 Testoval Chlorine DPD reagent refill pack Item number: 410520 Testoval Chlorine DPD 0.1 - 1 mg/l test kit

Iron 0–1 mg/l - Color Comparator Testoval - Concentration range 0–1 mg/l Fe The color comparator is a replacement device for the Testoval Iron 0–1 mg/l test kit (II) + (III) from Heyl and is used for the visual determination of iron in water samples. Reagents are not included in the scope of delivery. The Testoval color comparator for iron (0–1 mg/l) is used for the visual determination of iron in water samples. After adding the appropriate reagents, a characteristic color reaction occurs, which is compared with the integrated color scale in the device. This allows the iron concentration to be read quickly and easily. The device is used as a replacement unit for the Testoval iron test kit and enables manual water analysis without electronic measuring devices. By diluting the water sample in a ratio of 1:10 with distilled water, the measuring range can be extended to ten times the concentration. Technical Data Analyses: approx. 100 Measurement time: approx. 7 minutes The individual values 0.05 mg/l, 0.1 mg/l, 0.25 mg/l, 0.5 mg/l, 0.75 mg/l and 1 mg/l can be read by optical color comparison. Possible application areas of the color comparator Thanks to its compact design, it is suitable for both laboratory analyses and mobile on-site measurements. The color comparator is also ideal for monitoring iron in well and groundwater as well as for supervising water treatment systems. Advantages of the Testoval Iron 0–1 mg/l (II) + (III) from Heyl The determination of ferrous and ferric iron is carried out quickly and easily via optical color comparison. The iron content in the water sample can be reliably determined without the use of electronic measuring devices. The scope of delivery includes only a color comparator for simple concentration determination. Replacement reagents & the complete colorimetric test kit are also available in our shop. Item number 410547: Testoval Iron 0–1 mg/l Test Kit (II) + (III) Item number 410548: Refill pack: Reagents for Testoval Iron 0–1 mg/l (II) + (III)

Replacement color comparator without cuvette, for the concentration range 0–20 mg/l SO32-. Thanks to the Testoval color comparator, you can continue sulfite measurements without purchasing a new test kit. Due to its compact design, the device is ideal for mobile use and laboratory applications. The Testoval color comparator from Heyl is used for the fast visual evaluation of water samples in sulfite determination. It is optimally matched to the corresponding Testoval reagents and enables direct assessment of concentration through color comparison. After the reaction of the sample with the reagents, a characteristic coloration develops. This is compared with the stored reference values in the device, allowing the sulfite content to be determined easily. Your advantages with the color comparator Thanks to its compact design, the device is particularly practical for mobile use and is equally suitable for daily use in laboratories or technical systems. For these reasons, the device is lightweight and easy to use without prior knowledge of chemistry or extensive training. It can be used independently of power supply and electronic measuring devices. 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 only the color comparator for simple concentration determination. Additional products available in our shop Item number: 410634 Testoval sulfite test kit – complete set for analysis Item number: 410635 Testoval sulfite reagents refill pack – for additional analyses

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.

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