[Bluetooth 6-in-1 Chlorine Meter] Professionally measure the pH, ORP, chlorine, EC, TDS and temperature of swimming pool water quality. 1 device measures and gets 6 measurements at the same time, saving time and effort. [Cloud-based data management system] Accurate real-time Bluetooth data transmission with clear measurement values. Let you save, manage and share your test data on mobile APP, a good helper for managing your pool [Waterproof PH meter] PH meter can be placed directly in the pool to float, the is to enable you to know the change of water quality at the first time, IP67 waterproof rating, can prevent water penetration, suitable for short time immersion in the pool [Set Alarm] According to the demand you can set the highest or lowest value of PH, ORP, EC, test results out of range can be prompted on the APP, allowing you to disinfect the pool at the best time [High precision pool water quality tester] The high precision algorithm chip and electrode of our digital water quality tester accurate and fast response. Cell phone APP control backlight display to meet the needs of different people. PH Range:0.1-14.0 Resolution:0.1ph Accuracy:0.1ph Temperature Range:0.1-80.0 31.2-176 Resolution:0.1 or 0.1 Accuracy:0.5 EC Range:0-1999us or cm , 10.01- 20.0mS or cm , 2000-10000uS or cm Resolution:1uS or cm 10uS or cm 0.01mS or CM Accuracy:2 percent F.S. TDS Range:0-999ppm,1000- 9990ppt Resolution:1ppm 10ppm Accuracy:2 percent F.S. Range:0.1-4.0mg or L Resolution:0.1mg or L ORP Range:999mv Resolution:1mv Accuracy:15mv Display:LCD digital display Backlight:APP Control Temperature:Automatic Temperature Compensation 0-60 Operation Environment:0.1-80 RH:Max 90 percent PH calibration:pH:6.86 or 4.00 or 9.18 or 7.00 or 4.00 or 10.01, All functions have been calibrated when the product is sent out, please use it directly Colour:Black Material:plastic Package Contents: 1 x Handheld Refractometer Only the above package content, other products are not included. Note: Light reflection 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.