Water Hardness Test Strips: This home water test kit quickly detects the hardness of all water. Always provide real-time tests to keep water clean and safe to drink or use. Easy to Use: First, immerse one test strip into the water sample for 2 sec. Second, take out the strip and hold it horizontally for 15 sec. Last, compare the result with the color chart on the ziplock bag. Fast Accurate Result: The water testing kits are highly sensitive to detect even low levels of water hardness. Test range: 0-425 PPM or 0-25 GPG. And the easy-to-read color chart allows you to instantly interpret the test results. Regular Test: The water hardness test kit contains 100 strips in total. Really convenient to monitor the water quality at regular intervals. Effectively help maintain optimal water conditions to reduce limescale on pipes or home appliances. (The shelf life is 2 years before opening and 100 days after opening.) Reliable Material: Made of dependable fiber paper, the water testing kit provides instant results. Widely applicable to drinking water, tap water, wells, showers, water softeners, swimming pools, spas, laboratories, industry, etc. Product description