1This digital pH meter is convenient to use and easy to operate with reliable quality. 2The digital pH acidity meter features high accuracy and 0.00-14.00ph measuring range. 3Adopts high quality ABS material, it is durable and can be used for a long time. 4Support for data hold function, 0-50 working temperature, reliable to use. 5Stable performance, compact size and easy to carry, it is suitable for measuring water quality. Condition: 100% Item Type: pH Meter Material: ABS Model: PH-98105 Measuring Range: 0.00-14.00ph Accuracy: 0.2PH 0.1PH (at 20) Resolution: 0.01ph Working Temperature: 0-50 Automatic Temperature Compensation: 0-50 Electrode: E-201 Battery: 3 x 1.5V (AG13) (Not Included) Meter Size: Approx. 80 x 50 mm / 3.1 x 2 in Electrode Length: Approx. 165mm / 6.5 in Weight: Approx. 180g / 6.3oz Instruction: 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. 1 x Probe1 x pH Meter Electrode1 x Screwdriver1 x User Manual1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. 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.3. Battery is not included.