1Made of high quality ABS material, it is not easy to damage and durable in use. 2The high accuracy digital pH acidity meter is easy to operate and easy to use. 3High reliability, stable performance, compact size, light weight and easy to carry. 40-50 working temperature, it is suitable for measuring water quality. 5Support for data hold function, this digital pH meter is convenient to use. Condition: 100% Item Type: pH Meter Material: ABS Model: PH-98106 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-201B Battery: 3 x 1.5V (AG13) (Not Included) Product Size: Approx. 221 x 51 mm / 8.7 x 2 in Weight: Approx. 162g / 5.7oz 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. .w-e-text table td,.w-e-text table th,.wang-edit-text table td, .wang-edit-text table th{border: .5pt solid000;};.w-e-text table,.wang-edit-text table{border: 1px solid000important;}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.