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 for you 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. Large LCD Display Screen with Backlight: The large 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/ORP limit according to your needs, when the test results is above or below the range, the value will be displayed in red to alarm you. Specifications: Material: plastics PH: Ranges: 0.1-14.0pH Resolution: 0.1pH Accuracy: ±0.1pH CL: 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℃ Calibration: pH: 6.8/4.0/9.2 or 7.0/4.0/1.0 ORP: 256mV ATC temperature: 0.1℃~60℃ Environment: 0.1℃~80℃, RH: max 90% Total Dissolved Solids factor: 0.1-3.0 (factory default 0.5) EC Temp. Compensation: 0.1-3.0 %/℃ (Factory Default 2.0 %/C) BT: 5.2 version Waterproof: IP67 Battery: 3 * AAA battery (included) Data storage: can store the latest 1000 records of data Package size: 160 * 100 * 100mm / 6.3 * 3.9 * 3.9in Package weight: 210g / 7.4ounce Packing list: 1 * Water Quality Tester