A special “ready-to-use” test strip for determination of water hardness. Clear color changes from green to red guarantees reliable test results. Can precisely determine water hardness in a liquid very precisely from very soft water to very hard water. Since the color change is very clear and sharp with green / red indication they do not require any reference color scale for matching. The hardness of the water depends on its content of calcium and magnesium salts and expressed in terms of ppm (mg/l) CaCO3. Packed in a box of 100 strips of 6 mm width and 95 mm length.
