Usage Tips:Features: Quality Material: Made of quality ABS material, more durable. Backlight Display: Easy to read and does not affect the use in the dark. High Precision: Accurate to 0.1pH, more precise. Easy Operation: More Convenient. Replaceable Electrode: High cost performance. Wide Application: Suitable for the measuring of drinking water, hydroponics, aquarium, swimming pool, laboratory, etc. Specifications: Power Supply: DC 9V (Not Included) Measurement Range: 0.00-14.00pH Resolution: 0.01pH Accuracy: 0.1pH Temperature Compensation: 0-50(32-122) Operating Environment: Temperature: 0-50(32-122) Relative Humidity: Less than 85% Calibration Mode: Manual single-point calibration Material: plastic colour: As shown Package Contents: 1 x Digital PH Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.