Widely used in aquarium, glass fishpond, pharmaceutical research, agriculture, laboratory, water environment, quality control and other fields. Features: Easy to use, high accurancy. 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 or cm 12.88ms or cm 111.8ms or 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 or cm 10.01-19.99ms 20.1-400ms or cm Resolution: 1uS or cm 0.1 mS or cm Accuracy: 2 percent 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 percent of the reading Salinity: Resolution: 0.01 percent Accuracy: 0.01-5.00 percent (0.1 percent ) 5.10-25.00 percent (1 percent ) PH: Measuring range: 0.01-14.00pH Resolution: 0.01pH Accuracy: 0.05pH Operating environment: 0 to 60.0 celsius (32.0-140 Fahrenheit ) RH 100 percent TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0 celsius 32.0-140 Fahrenheit Temperature accuracy: 0.5 celsius Temperature resolution: 0.1 celsius or Fahrenheit Battery: 3 x LR44 (not included) Waterproof rating: IP67 Display size: 33x24mm Item size: 180 x 37mm or 7.1 x 1.5in Item weight: 86g or 3.0ounce Package size: 183 x 37 x 37mm or 7.2 x 1.5 x 1.5in Package weight: 90g or 3.2ounce Packing List: 1 x Water Quality Monitor Tester 3 x PH Buffer Powders Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store