Feature: 1. The measuring range is 0.00-14.00ph, which has sensitive response and high measurement accuracy. 2. With a small data display screen, the measurement results can be visually displayed on the screen for easy observation. 3. It is made of high quality ABS material, durable, wear-resistant and corrosion-resistant. 4. Support automatic temperature compensation function, simple calibration method, suitable for plant acidity, PH value measurement. 5. The method is simple and can be widely used in greenhouse planting, aquarium, hydroponics, laboratory and other fields. Specification: Condition: 100% Brand New Item Type: Acidity Meter Material: ABS Measuring Range: 0.00-14.00ph Accuracy: ±0.2PH ±0.1PH (At 20°C) Resolution: 0.01ph Working Temperature: 0°C-50°C Automatic Temperature Compensation: 0°C-50°C Electrode: SP300Z Battery: 3 x 1.5V (AG13) (Battery Not Included) Weight: Approx. 165g / 5.8oz Size: Approx. 230x51mm / 9.1x2.0in Instructions: 1.Connect the electrode and remove the protective cover. 2.The electrode of the pH meter is first washed with distilled water, and the moisture attached to the electrode is blotted dry with filter paper. 3.Touch the ''ON/OFF'' button to turn on the power. 4.Insert the pH meter electrode into the liquid to be measured until the electrode is immersed in the liquid about 4 cm deep. Do not immerse the solution in the electrode connection. 5.After gently stirring the solution to a stable value, read a stable display number. 6.Touch the ''HOLD'' button to keep the current measured value. If you need to re-measure, press the ''HOLD'' button again to release the hold status. 7.After use, press the ''ON/OFF'' button to turn off the power, wash the electrode with distilled water, and put on the protective cover. PH Calibration: 1.The pH electrode was immersed in a standard buffer solution of mixed phosphate with pH value of 6.86 (25°C) and shaken gently. 2.Adjust the correcting potentiometer with a small screwdriver until the display value is consistent with the pH value of the standard buffer solution at solution temperature. The electrodes of the pH meter are then cleaned with distilled water and the water attached to and around the electrodes is sucked dry with filter paper. 3.The electrode was inserted into the standard buffer solution of potassium hydrogen phosphate at pH 4.01 or borax at pH 9.18. 4.The value to be displayed is stable, and the value to be displayed should be within the allowable error range when compared with the pH value of buffer solution. Package List: 1 x Probe1 x PH Tester Electrode1 x Screwdriver1 x Instruction Manual Note: This acidity meter is delivered without batteries.