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【Total hardness】- The total hardness can be measured from < 54 > 90 > 180 > 270 > 360 > 450ppm CaCO3 【Convenient】- The convenient dip & read procedure and clear colour change, from green to red, ensures reliable results 【Rapid】- Test results can be seen within seconds of the test strip being placed into the water sample 【Colour change】- The colour change observed on the test stick is from green to red depending on the water hardness 【Shelf life】- These test strips have a shelf life of 2 years when kept under the right storage conditions - storage temperature 4-30oC