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 tools2. 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.3.Environmental protection: The water quality of the pool should be tested weekly. A pack of test strips includes 50 pool test strips and seals, 5 moisture-proof packages to ensure long-term storage.4. Health: 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.5.Test twice at the pool twice a week for best results.A good way to easily understand your water quality in the key.Type: 6-In-1 Swimming Pool TestDisplay Type: DigitalTest: TC, CL, PH, ALK, CYA, THTest Range:Total chlorine test range: 0 ~ 10ppmFree chlorine test range: 0 ~ 10ppmPH test range: 6.8 ~ 8.4Total alkalinity test range: 0 ~ 240ppmTotal hardness test range: 0 ~ 1000Cyanuric acid test range: 0 ~ 240Colour:As shown Material:PETSize:9.7*3.5cmPackage Contents:50*Swimming pool test stripOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.