Review on WaterWorks Industrial Test Systems 480014 by Joseph Stone

Bought these to test water as the H2O2 levels are too low (I think). I did a few control tests including 1ml of 3% H2O2 per liter of water and got the correct color for what I believe is 30ppm. Since my system requires 3ppm or so on spillage, it was important that the strips be tested to this low level. The testing process is quick and easy.