Hach Company / ETS Business Unit, makers of AquaChek® Pool & Spa test strips introduces a new test strip for High Range Free Chlorine. It measures high range free chlorine for many applications including sanitization and disinfection in and around pool and spa facilities in the range of 0 to 600 ppm (mg/L). English, French and Spanish directions are included on the package label. Additionally, the product is ideally packaged for professional use with 100 test strips per bottle.