Water Quality Testing Kit, Pool Management, Range Acid Demand Calculator, Free and Total Chlorine 0.2 to 3.0 PPM, pH 6.8 to 8.2, Total Alkalinity and Ca Hardness 60 to 400 PPM, Sensitivity 0.1 pH, 0.2 ppm, 60 PPM Alkalinity and Ca Hardness, Test System Colorimetric and Titrimetric, Number of Tests 20 Alkalinity and Ca Hardness, 50 Chlorine