Widely used in aquarium, glass fishpond, pharmaceutical research, agriculture, laboratory, water environment, quality control and other fields. Easy to use, high accuracy Quick and easy installation and operation EC: Support 3-point calibration automatic identification(1413us 12.88ms and 111.8ms) Built-in 3 calibration points(1413uS/cm 12.88ms /cm 111.8ms /cm) PH:1 point (6.86) or 2 point (6.86 4.00) (6.86 9.18) or 3 point (6.86 4.00 9.18) can automatically identify the calibration solution This is a professional water level test instrument, the operation is simple, the appearance of fashion, small size and easy to put in your pocket Has automatic temperature compensation 5 minutes no operation, the meter will automatically shut down. Save power, extend battery life(Battery is not included) With backlight function, it is more convenient to read Specifications: Material: ABS EC: Measuring range: 0 to10000uS/cm 10.01-19.99ms 20.1-400ms /cm Resolution: 1uS/cm; 0.1 mS/cm Accuracy: ±2% of the reading TDS: Measurement range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0 PPT Resolution: 1ppm; 0.1 PPT Accuracy: ±2% of the reading Salinity: Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) PH: Measuring range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH Operating environment: 0 to 60.0℃ (32.0-140℉); RH 100% TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0℃ 32.0-140℉ Temperature accuracy: ±0.5℃ Temperature resolution: 0.1℃/℉ Battery: 3 * LR44 (not included) Waterproof rating: IP67 Display size: 33*24mm Item size: 180 * 37mm / 7.1 * 1.5in Item weight: 86g / 3.0ounce