Water analysis with the first patented long-life liquid indicator solution:
Accurate dosing in our Testomat® instruments, easy handling and long shelf life make Heyl indicators the preferred high-performance liquid indicator system to measure your desired water parameters.
Depending on the type of instrument and analysis parameter, our indicators are available in 100 ml or 500 ml per bottle.

You can measure the following parameters in the hardness range with our original indicators:

  • Residual hardness
  • Carbonate hardness
  • minus m-value
  • p-value