Not very useful for a fresh water tank but helped me know when to pull out a real test kit. Bought a very reasonable tank water change alarm, sticks to the glass and the central display changes color when the ammonia level gets high, great product if you are starting a new tank.
Highly Efficient Seachem Purigen for Freshwater & Saltwater Filtration
9 Review
FUNSWTM 7 in 1 Aquarium Test Strips: Accurate Water Testing for pH, Nitrite, Nitrate, Chlorine, GH & KH Levels
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Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review
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26 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review