Features: 4 In 1 Detecting Function: This water quality tester can measure the PH, Total Dissolved SolidsTotal Dissolved Solids, EC, temperature and chlorine in water and help you fully understand the water quality of the tested water. Mobilephone APP Remote View: After connect with your mobilephone correctly through the BT, all testing results can be viewed on the APP. LCD Display Screen with Backlight: The display screen with backlight allows you to read the testing data normally even in dim light or even in total dark, and you can turn on\/off the backlight on your mobilephone. IP67 Waterproof: The IP67 waterproof level makes this product can be normally used in water and can provide a long service time. You can set a high or low PH\/EC\/TDS\/ORP limit according to your needs, when the test results is above or the range, the value will be displayed in red to alarm you. Specifications: PH: Ranges: 0.1-14.0pH Resolution: 0.1pH Accuracy: 0.1pH : Ranges: 0.1-4.0mg\/L Resolution: 0.1mg\/L Total Dissolved Solids: Ranges: 0-999ppm, 1000-9990ppm Resolution: 1ppm, 10ppm Accuracy: 2%F.S ORP: Ranges: -999+999mV Resolution: 1mV Accuracy: 15mV Temperature: Ranges: 0.1~80, 32.1~176.0 Resolution: 0.1 Accuracy: 0.5 Material: Plastic colour: Blue Package Contents: 1 x Water Quality Detector 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.