Widely used in aquariums, glass fishponds, pharmaceutical research, agriculture, laboratories, water environments, and quality control applications. Features: Easy to use with high accuracy. Quick and simple installation and operation. EC: Supports 3-point calibration with automatic identification (1413 µS, 12.88 mS, and 111.8 mS). Built-in 3 calibration points (1413 µS/cm, 12.88 mS/cm, 111.8 mS/cm). pH: Supports 1-point (6.86), 2-point (6.86, 4.00 or 6.86, 9.18), or 3-point (6.86, 4.00, 9.18) calibration with automatic solution recognition. Professional water quality testing instrument with simple operation, modern design, and compact size for easy portability. Includes automatic temperature compensation. Auto power-off after 5 minutes of inactivity to conserve battery life. (Battery not included) Backlight function for easier reading in low-light conditions. Specifications: Material: ABS EC: Measurement range: 0 to 10,000 µS/cm, 10.01–19.99 mS/cm, 20.1–400 mS/cm Resolution: 1 µS/cm; 0.1 mS/cm Accuracy: ±2% of reading TDS: Measurement range: 0 to 1000 ppm, 1000 to 10,000 ppm, 10.1 to 200.0 PPT Resolution: 1 ppm; 0.1 PPT Accuracy: ±2% of reading Salinity: Resolution: 0.01% Accuracy: 0.01–5.00% (±0.1%), 5.10–25.00% (±1%) pH: Measurement range: 0.01–14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Operating environment: 0 to 60.0°C (32.0–140°F); RH 100% TDS factor: 0.4 to 1.0 Temperature range: 0.1–60.0°C (32.0–140°F) Temperature accuracy: ±0.5°C Temperature resolution: 0.1°C / °F Battery: 3 x LR44 (not included) Waterproof rating: IP67 Display size: 33 x 24 mm Item size: 180 x 37 mm (7.1 x 1.5 in) Item weight: 86 g (3.0 oz) Package size: 183 x 37 x 37 mm (7.2 x 1.5 x 1.5 in) Package weight: 90 g (3.2 oz) Packing List: 1 x Water Quality Monitor Tester 3 x pH Buffer Powders