1.Upgrade 6 inches (about 6 cm) 1 liter: test PH, total chlorine, no chlorine, total alkalinity, acid purification, full hardness, etc., more powerful than 5 or 4 pool test panels and liquid test tools 4. Health: Test strips are used for swimming pool, spa, water testing, and you can that the right amount of chemicals are in the pool to avoid health problems and equipment damage. 3.Environmental protection: The water quality of the pool should be tested weekly. of test strips includes 50 pool test strips and seals, 5 moisture-proof packages to long-term storage. 2. 17S test: There are 2 test strips for underwater soaking pools, keep about 15 in the air, and then match the color of the strip to the color on the back of the bottle, which takes about 17 seconds. Pool test strips are easy to use and even suitable for beginners. 5.Test twice at the pool twice a week for best results.A good way to easily understand your water quality in the key., Weight: 0.0661386786 Pounds, Manufacturer: Aisuoka