pH Meters features: Do you know that all kinds of leaves, grass, dust, rain, etc. will pollute the swimming pool? Poor water quality can cause damage to disease and swimming pool equipment. Therefore, it is very important to test the water quality of the pool regularly. Keeping pools cleaning is another way to keep human body health. Features Color: As shown Material: PET Size: 13.80X5.00X5.00cm/5.42X1.97X1.97 inch Test time: About 60s Accuracy: 96% Suitable for various occasions, it can testing total chlorine, free chlorine, bromine, hardness, nitrite, pH, alkalinity Each pool test strip provides accurate results for any water sources including spas and hot tubs for periodical testing and monitoring Immerse the test paper in water for 2 seconds, let it sit in the air for about 60 seconds, and then match the color of the strip to the back of the bottle Test strips are used for swimming pool, spa, hot tub water testing, and you can ensure that the right amount of chemicals are kept in the pool to avoid health problems and equipment damage Water quality should be tested once a week. A good way to easily understand your water quality in the key.