Hanna (HI93728-01) Nitrate, Cadmium Reduction Method (100 Tests)Hanna Instruments HI93728 01 Nitrate Test Reagent Kit Cadmium reduction method reagents for precise nitrate measurement in drinking water, aquariums, and irrigation systems 100 Tests 0. 030. 0 mg L Range Cadmium Reduction EPA Compliant The Hanna HI93728 01 reagent kit uses the cadmium reduction method to accurately measure nitrate levels in water from 0. 0 to 30. 0 mg L. This 100 test kit is designed for use with Hanna photometers and colorimeters,