Features: Used to test total chlorine, free chlorine, PH, total alkalinity, cyanuric acid and total hardness Simple to use, just immerse yourself in the water for 2s and then hold it in the air about 15s to get the result Perfect for swimming pool, spa, jacuzzi, water testing and so on Simple and perfect way to know the water quality in a few seconds Specification: Item Type: Pool SPA Indicator PaperTest: TC, CL, PH, ALK, CYA, ThiQuantity: 50/bottleTest Range:Total Chlorine: 0 - 10ppmFree Chlorine: 0 - 10ppmPH: 6.8 - 8.4Total Alkalinity: 0 - 240ppmCyanuric Acid: 0 - 240Total Hardness: 0 - 1000Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color change for different display settings. Thank you for your understanding, have a nice day! Package Included: 1 x Swimming Pool SPA Bottle Water Test Tape (50pcs/bottle)