6 IN 1 Test Strip: The ph test strip is newly upgraded, with 6 in 1, which can simultaneously test six kinds of PH, total chlorine, free chlorine, total alkalinity, cyanuric acid, and total hardness. More effective than other hot tub test strips. To ensure your hot tub is safe, clean and ready to use anytime. Easy to use: ensure your water is sufficiently agitated then simply dip the water quality testing strip fully into the water, remove and hold horizontally then read against the coloured chart on the side of the bottle in 30 seconds, allowing you to spend less time testing your water and more time enjoying it! Easy to Store: Test strips for pool are packaged in a well-sealed bottle to ensure they can be stored for 2 years. Too many or too few chemicals can both compromise the water's safety, our strips can keep your water healthy and clean all year round. PH test strips were packed in a easy-to-store container to ensure long-term storage. High-Percision Results: These water hardness test strips are designed specifically for warm water that can easily provide instant and reliable results in no time without putting in much effort. Use at least twice per week or as needed to monitor your water quality at regular intervals. Application: This water chemical testing kit contains 50 test strips. Enough balanced for your swimming pool, hot tub, spa and other water testing. At least testing twice a week is recommended to keep your pool sparkling clean and safe.