Universal Compatibility - 1/4" quick connect fittings work with most reverse osmosis systems

Aquaponics & aquaculture systems

Featuring a replaceable probe

and extends the operational life of your ORP57 PRO Tester investment

Ideal for full-time RVers

Hanna Saltwater Aquarium Ultra Low Range Nitrite Colorimeter - Checker HC - HI764 freshwater testing Universal Compatibility - 1/4" quickStop struggling to get accurate results for your saltwater aquarium with our simple handheld colorimeter. Our nitrite colorimeter fills the gap between nitrite test kits and advanced instrumentation. Standard test kits have limited accuracy since they depend on the human eye to determine colors. Our handheld colorimeter eliminates the trouble of matching to a color chart by providing a direct saltwater nitrite result. Our portable handheld colorimeter