3 in 1 test stripsThe pool test strips can test free chlorine or bromine, pH, total alkalinity, fast and accurate test. Chlorine, test range 0-1-3-5-10 PH, test range 6.8-7.2-7.4-7.6-8.0-8.4 Alkalinity , The test range is 0-40-80-120-180-240. Easy to UseJust immerse a test strip in water about 2 seconds, take it out and hold itlevel for about 15 seconds, and then check the result with the color card on the bottle. Easy to storeTwo Plastic bottles of our test strips include 100 pool test strips and seal well with 5 individual moisture-proof packages to ensure carryout and long-term storage. Water Health TestIt is suggested to test at both ends of the pool twice a week to obtain the best results, so that you can know whether the pool water spa hot tub is in a healthy and clean state. Wide ApplicationThis water test strip is suitable for swimming pool, hot tub, aquarium, sewage, tap water, drinking water, an Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.