Hydrion (QT-10) Quat Test Kit for validating the quaternary ammonium concentration of sanitizing solutions made with Steramine. Each kit consists of 15 test strips and one color chart. To use, first immerse in solution or spray one strip and let sit for ten (10) seconds. Compare while wet with color chart to determine active ingredient concentration of Steramine solution. Color chart indicates a different color at concentrations of 200 and 400 parts per million (ppm). The test strips should be kept in closed packet when not in use.

Dive Gear Express recommends the stronger concentration of at least 400 ppm if you are spraying and a concentration of at least 200 ppm if you are soaking.