Feature:1. 5in1: The multi functional Bluetooth water quality test pen can accurately measure the values of PH, TDS, EC, SALT, TEMP.2. Mobile Phone App Control: Turn on Bluetooth, open the mobile phone APP, mobile phone control functions, no need for button operation, full screen display.3. Wide Application: Widely used in drinking water, sewage treatment, water purification, fish tanks, breeding, swimming pools, hydroponics, medical treatment, etc.4. Temperature Compensation: PH water quality tester has automatic temperature compensation, the compensation range is 0.160.5. Sensitive Electrode: The PH water quality test pen uses highly sensitive glass electrode, waterproof and rustproof electrodes, and can be detached.Specification:Item Type: Water Testing MeterMaterial: ABSRange, Resolution, Accuracy:PH: 0.00-14.00PH, 0.01PH, 0.05pHTDS: 0-999ppm 1000-9990ppm, 1ppm; 10ppm; 0.1ppt, 2%F.S. 10ppmEC: 0-9999S/cm; 10.01-19.99ms/cm; 20.1-200.0ms /1s/cm; 0.01ms/cm / 2%F.S.TEMP: 0.1-60.0, 32.1-140.0 0.1; 0.1 / 0.5Salt: 0.01-25.00%; 0-9990ppm; 10.1-100.0ppt 0.011ppm; 10ppm; 0.1ppt 2%F.S. 10ppmCalibrationPH: 4.00--6.86--9.18/4.00--7.00--10.01EC TDS, Salt: 1413s/cm; 12.88ms/cm; 111.8ms/cmBattery: 3pcs 1.5V LR44 (not include)Size: Approx. 187x37x37mm/7.36x1.46x1.46inTemperature Compensation Range: Automatic (0.1-60)Bluetooth: Bluetooth version 5.2Backlight: Mobile phone controls the backlightApplication: Widely used in drinking water, sewage treatment, water purification, fish tanks, aquaculture, swimming pools, hydroponics, medical treatment, etc..Package List:1 xWater Testing Meter1 x Cover1 x Manual