Features: The economical portable monitor is equipped with dual power supplies, tested by battery or long-term continuous testing and monitoring via the power adapter. Made of ABS quality material, and designed to digitally measure the pH of any type of water. Comes with a cable that is about 1.5 meters long (from the meter to the sensor), clearly showing the readings, and can be easily operated with just one power button. Suitable for aquariums, swimming pools, spas, laboratories, hospitals, hydroponics and other applications where accurate pH measurement and monitoring are required. Built-in automatic temperature compensation (ATC), easy to use, high precision. Configure large LCD display, 4-digit display, accurate measurement. The product is pre-calibrated at the factory and can be easily calibrated with a small screwdriver. Can be powered by battery or DC6V power adapter (both included). Easy to move, and reduce the hanging wire in the aquarium area, with a clip for the fixed host. Specifications: Condition: 100% Brand New Material: ABS Measuring range: 0.00 - 14.00 pH Resolution: 0.01 pH Accuracy: ±0.1 pH Automatic temperature compensation (ATC): 0 - 50 °C (32 - 122 °F) Operating temperature: 0 - 50 °C (32 - 122 °F) Battery: 4 x 160mAh LR44 button batteries Size: As picture shown Weight: approx. 320g / 11.3oz Package list: 1 x Mini pH monitor with external electrodes 1 x Electrode protection cap 1 x Mini screwdriver 4 x LR44 button batteries 1 x Clip 1 x Suction cap 1 x English manual Note: 1.This product needs to be assembled by yourself. 2.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 3.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. .