【5-in-1 Water Quality Tester】 This digital pH tester monitors TDS, pH, salt content, EC, and temperature. 【High Accuracy】 The high-precision algorithm chip and electrodes of our digital water pH tester ensure accurate and fast readings. When the measured value is stable, simply press and hold the HOLD/TEMP button to lock the reading and exit the display—it's very easy to use. 【Dual Salt Meter】 This digital pH tester can detect the salt content of food. It can also detect the salt content of seawater. The measurement range for food salt content is 0.00-25.00%, and the measurement range for seawater salt content is 10.1-200.0 ppt. 【Auto-Off Function and Large Display】 The pH tester features a backlit LCD screen, allowing you to clearly see measurement results under all circumstances. The auto-off function turns the device off after 5 minutes of inactivity to save energy. Fully transparent liquid crystals (LCDs) are used to display 4-digit values and their corresponding physical units. 【Automatic Temperature Compensation】 Temperature will affect the measured value. The digital hydroponic pH meter has an optimal range of 0°C to 60°C (32°F to 140°F). Automatic temperature compensation ensures you get the best reading, so you can test with confidence in any environment. Specification: Conductivity Test 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 test range: 0 to 1000 ppm 1000 ppm to 10000 ppm 10.1 to 200.0 ppt Resolution: 1 ppm; 0.1 ppt Accuracy: ±2% of reading Salinity measurement range: 0.00 to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) pH test range: 0.01-14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Temperature compensation: Automatic Temperature Compensation (ATC) Operating environment: 0 to 60.0 °C (32.0 to 140 °F); RH 100% Temperature range: 0.1-60.0℃ 32.0-140℉ Temperature accuracy: ±0.5°C Temperature resolution: 0.1℃/℉ Auto shut-off: approximately 5 minutes 3x1.5LR44 Bare metal size and weight: 183*37*37mm (7.2*1.5*1.5in)/90g (3.2oz) Display: supports backlight Waterproof rating: IP67 Power consumption: 2.9mA, power consumption is 0 when off Note: After each use, be sure to clean the electrode