Review on 🐠 AQUA CARE PRO 6-in-1 Freshwater Aquarium Test Strips - pH, Nitrite, Nitrate, Chlorine, General Hardness, Carbonate Hardness (GH & KH) - Easy-to-Read Wide Strips for Fish Tank Testing by Andrea Scoggin

Simultaneous measurements of two strips do not give the same results. Test squares regularly fall off the strip. The color on the squares is rarely uniform. Color flows from one square to another. It all boils down to "what I'm looking at." Not really bad I think. If the colors are acceptable, I've compared KH and GH with the Slurry test kit and they're pretty close. PH, although I'm not sure, shows any changes. I added Alkaline Buffer to increase KH and PH and didn't notice any change in PH hue. This shows something sensible to read "nitrate". Bottom Line: Stop wasting money on test strips and get liquid solution test kits.