Macherey-Nagel VISO Color Standards Chlor, Set with 4 coloured solutions

Colored reference standards for checking the photometer (0-4 mg / L Cl2) Contains four colored solutions that simulate the test color at different concentrations, certificate and instructions, in a case. Works in all photometric VISOCOLOR chlorine methods. Suitable for PF-3, PF-12Plus, VIS II and UV / VIS II