Review on 🐠 Enhance your Aquarium's Quality with SJ WAVE 6-in-1 Test Strip - Accurate Water Testing for Freshwater Aquariums & Ponds (100 Tests) by Renee Zahid

I used them twice a week for a month before I realized the colors on the strips always looked the same. So I tested one with filtered water, one with tap water and one with dirty aquarium water. Surprisingly, they all read the same way. (See photo. Filtered water on the left, tap water in the middle, and tank water on the right. Not that it matters because they all look the same.) Save yourself the hassle and buy something else to check the water in the tank.