Feature: 1. 5‑in‑1: 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 0.1℃‑60℃. 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 Meter Material: ABS Range, Resolution, Accuracy: PH: 0.00-14.00PH, 0.01PH, ±0.05pH TDS: 0-999ppm 1000-9990ppm, 1ppm; 10ppm; 0.1ppt, ±2%F.S. 10ppm EC: 0-9999μS/cm; 10.01-19.99ms/cm; 20.1-200.0ms /1μs/cm; 0.01ms/cm / ±2%F.S. TEMP: 0.1℃-60.0℃, 32.1℉-140.0℉ 0.1℃; 0.1℉ / ±0.5℃ Salt: 0.01-25.00%; 0-9990ppm; 10.1-100.0ppt 0.01‰1ppm; 10ppm; 0.1ppt ±2%F.S. 10ppm Calibration PH: 4.00--6.86--9.18/4.00--7.00--10.01 EC TDS, Salt: 1413μs/cm; 12.88ms/cm; 111.8ms/cm Battery: 3pcs 1.5V LR44 (not include) Size: Approx. 187x37x37mm/7.36x1.46x1.46in Temperature Compensation Range: Automatic (0.1℃-60℃) Bluetooth: Bluetooth version 5.2 Backlight: Mobile phone controls the backlight Application: Widely used in drinking water, sewage treatment, water purification, fish tanks, aquaculture, swimming pools, hydroponics, medical treatment, etc.. Package List: 1 x Water Testing Meter1 x Cover1 x Manual