7 In 1 Pool And Spa Test Strips Kit 50 Accurate Test Strips For Spa, Swimming Pool And Hot Tubs Features: pool test strips can be used to test pH, total alkalinity, cyanuric sourness, total hardness, etc., with more of features that other test strips and liquid test kits the test paper in water for seconds, leave it in the for about 15 seconds, and then match the color of the tape to the back of the bottle. In just about 17 seconds, you can read the data The quality of the pool water should be tested once week. Our test strips include 50 pool test strips Test strips for pools, spas, spas Test the quality of the water, you can ensure the quality of the water in the pool to avoid health problems and damage to property Suitable for water testing of domestic water,, swimming pools and spas, industrial water, pool, spa water and many more. Specification: Material: paper Size: About 9.6x3.8cm/3.7x1.4in Package List: 1x bottle of PH test strips (50 strips) Notes: Due to different displays and lighting effects, the actual color of the product may be slightly different from the color shown the picture. Thanks! Due to manual measurement, allow slight measurement deviation. 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.