Blue color Size: 183*37mm 5 in 1 Water Quality Tester: Digital pH tester can monitor TDS, pH, salinity, EC meter and temperature measurement. TDS measurement range: 0-200,000 ppm, EC measurement range: 0-200,000 S/cm, pH measurement range: 0.01-14.00 pH, salinity measurement range: 0.00-25.00%, temperature conversion function. High Accuracy: The high precision algorithm chip and electrode of our digital water pH tester ensure a precise and fast response. When the measurement is stable, press the HOLD/TEMP key to lock the reading for easy viewing. Two salinity measurement modes: The digital meter can detect food salinity from 0.00 to 25.00% and seawater salinity from 10.1 to 200.0 ppt. Auto-off function and large screen: The pH tester features a backlit LCD screen for clear visibility in all conditions. Auto power-off function turns the device off after 5 minutes of inactivity to conserve battery life. The LCD displays 4-digit values with corresponding measurement units. Automatic Temperature Compensation: Temperature may affect readings. This digital pH meter operates from 0C to 60C (32F to 140F) with automatic temperature compensation for accurate results in any environment. Waterproof Rating: IP67 (can be used after being submerged in water) Replaceable probe Auto calibration Note: Measurements are taken manually. Please allow a tolerance of 1-3 cm. Color may vary slightly due to lighting and screen differences. Actual product may vary slightly from images.