Total Hardness test strips for water quality offer a wide range of detection and calibrated to be both accurate and sensitive. With their low cost and high accuracy, Total Hardness test strips also offer you a 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. Details: Bottle of 50 Test Time: 3 Seconds Detection Levels: 0, 40, 80, 120, 180, 250, 425, 1000 ppm (mg/L) or