1.Easy to use Drinking water test kit. Hold the strips horizontally and tap or shake them gently to remove excess water. Dip the test strip into the desired water sample and remove it within 12 seconds. Read the test results carefully in 60 seconds and compare the test area near the colour chart on the bottle label. 2.Easy to carry: the water test kit is small and lightweight. It can be stored as desired in a backpack without taking up space. It is convenient for you to carry and use when you go out. 3.Wide range of applications: the water hardness test kit is versatile. Can be used to test any water source around you. Suitable for drinking water, well and tap water, swimming pools, hot tubs, aquariums and more. 4.Reliable tests The water test kit covers all the important impurities you need to worry about. Use tap water, well water, filtered water or other water source. Offers the widest range of parameters on the market.