The water quality monitor is professional and useful tool for testing PH/TDS/TEMP of solution level. Suitable for aquarium pool and environment water. Features: Use to measure the PH & TDS & TEMP of solution. Electrode probe can be replaced, ATC function. Easy calibration of pH and TDS. Large and clear LCD with backlight, easy to read and accurately measuring functions. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Automatic temperature compensation. Specifications: Range: pH: 0.00 14.00pH TDS: 0.00 19990ppm Temperature: -50 70 (-58 158) Resolution: pH: 0.01pH TDS: 10ppm Temperature: 0.1 (0.2) Accuracy: pH: 0.1pH TDS:2%F.S Temperature: 1 (2) Temperature Compensation: 0C 50C (32F 122F) Working temperature: 0C 50C (32F 122F) Power Supply: DC 4.5V (Power Adapter Usable) Battery: 31.5V LR44 Button Cell Batteries (NOT Included) Color: Grey Material: ABS Item Size: Approx. 188 * 40 * 40mm / 7.4 * 1.6 * 1.6in Item Weight: Approx. 75.6g / 2.7oz Package Size: Approx. 21 * 6.2 * 4.4cm / 8.3 * 2.44 * 1.73in Package Weight: Approx. 139g / 4.9oz Package List: 1 * pH & TDS & TEMP Meter 1 * User Manual