Item Type: Acidity MeterMaterial: PlasticColor: As Pictures Shown Purpose: Soil Acidity MeterMeasuring Range: 0.00-14.00PHAccuracy: 0.1pH (at 20), 0.2phResolution: 0.01PHBattery: 3 x 1.5V (AG-13 Button Battery)Working Temperature: 0-50Calibration: 1 Point CalibrationSize: Approx. 234mm x 51mm x 25mm / 9.2 x 2.0 x 1.0inOperation Steps: 1. Touch the "HOLD" key to keep the current measured value. If you need to re-measure, then press the "HOLD" key once to release the hold state. 2. After use, press the "ON/OFF" button to turn off the power, clean the electrode with distilled water, and put on the protective cover.PH Calibration:1. Immerse the PH electrode in a mixed phosphate standard buffer solution with a pH of 6.86 (25C) and shake it gently.2. Adjust the calibration potentiometer with a small driver until the displayed value matches thePH of the standard buffer solution at solution temperature.The PH meter electrode is then cleaned with distilled water and the moisture attached to and around the electrode is sucked up with filter paper.3.Insert the electrode into potassium phosphophthalate at PH4.01 or borax standard buffer at pH9.18.4. When the displayed value is stable, the displayed value should be within the error tolerance range compared with the PH value of the buffer solution.1.This digital pH meter is convenient to use and easy to operate with reliable quality.2.The digital PH acidity meter features high accuracy and 0.00100ph measuring range.3.Adopts ABS material, it is durable and can be used for a long time.4.Stable performance, compact size and easy to carry, it is suitable for measuring water quality.5.With a small data display screen, the measurement results can be visually displayed on the screen for easy observation, the acidity meter can be widely used in greenhouse planting, aquarium, hydroponics, laboratory and so on.