TETRA TEST KITS FOR AQUARIUMS FISH TANKS PH NO2 NO3 NH4 KH GH O2 WATER TESTS
Tetra NO3 Test Kit. TETRA TEST NO3-. Tetra NO2 Test Kit. TETRA TEST NO2-. Tetra GH Test Kit. Tetra Test Kits Full Range. No3 – the nitrate content shows how ’fresh’ the water is, and also how likely it is to support algae growth.