SpecCheck Gel Secondary Standard Set, Ozone, Mid-Range

Used to confirm consistent instrument response. For Ozone Indigo method, MR, 0-.75 mg/L as O₃ Used to confirm consistent instrument response. Set contains four vials filled with gels that simulate the test color at various concentrations.
SpecCheck Secondary Standards Kits also include instructions, plastic case and Certificate of Analysis. Vials are filled with gels that simulate the test color at various concentrations. SpecCheck Standards are computer-formulated and have a two-year shelf life from date of manufacture. Hach SpecChecks are non-hazardous and do not require an SDS.