Total Hardness test strips are perfect for service work, classroom demonstrations, or to give to customers instead of an expensive service call. Total Hardness test strips for water quality offer a wide range of detection and are calibrated to be both accurate and sensitive. With their low cost and high accuracy, Total Hardness test strips also offer you time-savings. No more counting drops or waiting for laboratory results. With total hardness water quality test strips you are in control and can find out exactly where your calcium level is before it becomes a problem. Waterworks Total Hardness test strips make it easy to verify that your water conditioning equipment is working properly! Detection Range: 0, 40, 80, 120, 180, 250, 425, 1000 ppm (mg/L) OR 0, 2, 5, 7, 11, 15, 25, 58 gpg. Total Test Time: 3 Seconds. Number of Tests: Bottle of 50