1、Made of high quality ABS material, it is not easy to damage and durable in use. 2、The high accuracy digital pH acidity meter is easy to operate and easy to use. 3、High reliability, stable performance, compact size, light weight and easy to carry. 4、0℃-50℃ working temperature, it is suitable for measuring water quality. 5、Support for data hold function, this digital pH meter is convenient to use. 1 x Probe1 x pH Meter Electrode1 x Screwdriver1 x User Manual Condition: 100% Brand NewItem Type: pH MeterMaterial: ABSModel: PH-98106Measuring Range: 0.00- 14.00phAccuracy: ± 0.2PH ± 0.1PH (at 20℃)Resolution: 0.01phWorking Temperature: 0℃-50℃Automatic Temperature Compensation: 0℃-50℃Electrode: E-201BBattery: 3 x 1.5V (AG13) (Not Included)Product Size: Approx. 221 x 51 mm / 8.7 x 2 inWeight: Approx. 162g / 5.7ozInstruction: 1. Connect the electrode and remove the protective cover. 2. The electrode of the pH meter is firstly washed with distilled water, and dry the moisture attached to the electrode 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 4cm 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 state. 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. Immerse the pH electrode in a mixed phosphate standard buffer solution with a pH of 6.86 (25℃) and shake gently. 2. Adjust the potentiometer with a small screwdriver until the displayed value matches the pH of the standard buffer solution at the solution temperature. The electrode of the pH meter was then washed with distilled water, and the water attached to and around the electrode was dry with filter paper. 3. Insert the electrode into potassium phthalate pH 4.01 or a standard buffer solution of borax pH 9. 18. 4. After the value to be displayed is stable, and the displayed value should be within the error tolerance range compared with the pH value of the buffer solution.