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