PC102 Pool Water Quality Tester 1. You must prepare a 1.5 ppm chlorine solution, the purpose of your pool water inspection 2. If you are at 1.5ppm chlorine level or not (don't know if it is or can't find the calibration point), please use the traditional test strip 3. Once you are happy with your calibration, you do not need to recalibrate unless you change the measuring pool to use different pool water. A brief description: The design of risepro tester is suitable for swimming pools or SPA family ratios (excluding salt lake water pools, industrial or scientific use). After the first successful calibration, you can test the chlorine and acid-base levels of your pool water in a simple and fast way. Therefore, there is no need for complicated and messy "traditional liquid chlorine and acid-base combinations"! With this handy tester you can quickly test whether your chlorine and pH fall within the ideal range of 7.8: chlorine 1.2 1.7 ppm and pH 7.2 lied. If your test results are beyond this range, please leave you a useful information and a corresponding pool that adapts to chlorine, acid and alkali. It is definitely a great tool you may need to keep pool water. Specification: Recommended chlorine level for swimming pool and SPA is 1.2, 1.7 ppm It is recommended that the pool and SPA PH level be 7.2, 7.8 Main unit: 180mm x 20mm Handle Probe: 150mm long Probe (only): 48mm long Cable (only): 300mm long Power supply: 1 x AA alkaline battery (1.5V) does not contain Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.