Check for Nitrite easily in your tank. The Hanna HI764 Checker HC Handheld Colorimeter for Nitrite ULR bridges the gap between simple chemical test kits and professional instrumentation. Accurate, affordable and easy to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Hanna Nitrite Checker, press the button and read the results. Done.
Replacement Reagents - HI764-25 Nitrate ULR Replacement Reagents
HI764 Nitrite Ultra Low Range Colorimeter Manufacturer's Manual