100/50pcs Chlorine Dip Test Strips Hot Tub SPA Swimming Pool PH Tester Paper 7 in 1 Pool and Spa water quality test strips Specification: Shelf life: 1 year Test time: 30 seconds Detection elements: total hardness, free residual chlorine, total chlorine, cyanuric acid, total alkali, and pH. Scope of application: Swimming pool water, hot spring water Please note: Do not put wet fingers into the bottle. Do not touch or contaminate the detection block on the test strip with your hands. Tighten the bottle cap after removing the test strip each time. Compare the color of the test strip under good light to obtain a reading. Store in cool, dry, and dark conditions. It is recommended to use it within 90 days after opening. Packaging list: 1 * 50/100 test strips (optional) 3 in 1 Pool and Spa water quality test strips Specifications: High precision and easy operation. It is easy to carry. Water test in swimming pool or spa pool. Effective chlorine, pH, and total hardness can be tested. A good way to easily understand your water quality in the key. Item Name: Test Strip Material: PH Test Strip Quality: 50Pcs/Box Detectable PH Range: 6.8 - 8.4 Residual Chlorine Range: 0 - 10 Total Hardness Range: 0 - 240 Features: Precision, Easy to Use, Portable Package includes: 1 bottle of Pool SPA Test Strips