*Simple and clear instructions make these hassle-free test strips super easy to use. You don't need to mess with a complicated test kit to reliably check the hardness of your water. Simply dip the strip into the water and compare with a large color chart on the bottle. *100 high-quality test strips provide a cost-effective way to regularly test your water softener, aquarium, pool and spa water. Even better, the unused strips remain airtight and dry for future use, allowing you to carry out measurements up to 10 months after initial use. Specifications: *100 Pcs Water Total Hardness Test Strips Quick and Easy Testing Kit 0-425 PPM *Test Items:Hardness *Test Range: 0-425 PPM *Material: PET *Size: 110 * 5mm (Approx) *Color: As Pictures Show Package Contents: 1 Tube (100Pcs) of Water Test Strips Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. *Made of high-quality materials, more durable. *The total hardness is measured in both 0-425 PPM, making it a perfect tool to calibrate your water softener or simply check the water hardness. *Save time and get the test results within seconds. No need to visit a hardware store or wait for someone else to check the quality of your water. *The reliable and consistent accuracy of these test strips provide a simple and convenient way to measure water hardness. *brand new and high quality.