Feature: 1. Advanced electronic technology and exquisite technology make the instrument power consumption very low and the measurement data is stable. 2. Easy to operate and portable to carry around. High accuracy and fast response, providing fast, accurate and reliable reading data. 3. Application in aquaculture, swimming pool, fish tank and water purification and other water systems. 4. It is used to quickly detect the PH value of water, ensuring the safe use of water，PH 7.0-8.5 is best for the human body. 5. Press the HOLD key to lock the data, it will no longer change to facilitate the recording and comparison of data. Specification: Condition: 100% Brand New Item Type: Water Detector Material: ABS PH Measurement Range: 0.00-14PH Precision: +0.2PH +0.1PH(at 20°C) Resolution: 0.01ph Operating Temperature: 0°C-50°C Automatic Temperature Compensation: 0°C-50°C Electrode: SP300C Battery: 3x1.5V (AG13) (not included) Size: Approx. 221 x 51mm / 8.7 x 2in Weight: Approx. 165g / 5.8oz Usage: 1. Attach electrodes and remove protective cover. 2. Clean the pH meter electrode with distilled water and blot the water attached to the electrode dry with a filter paper. 3. Tap the "ON/OFF" button to connect the power. 4. Insert the pH meter electrode into the measured liquid until the electrode is immersed in the liquid about 4cm deep. Do not immerse the solution into the electrode connection. 5. Gently stir the solution until the value is stable and read the stable display number. 6. Touch the "HOLD" key to maintain the current measured value. If remeasurement is needed, press the "HOLD" button again to release the holding state. 7. After use, press "ON/OFF" to turn off the power, clean the electrode with distilled water and put on a protective cover. PH Calibration: 1. Immerse the pH electrode in the mixed phosphate standard buffer solution with a pH value of 6.86 (25℃) and shake gently. 2. Adjust and correct the potentiometer with a small screwdriver until the displayed value is at the solution temperature of the standard buffer solution. Clean the pH meter electrode with distilled water and attach the filter paper to the electrode. 3. Insert the electrode into potassium phosphophthalate at pH4.01 or borax standard buffer solution at pH9.18. 4. When the display value is stable, the display value should be within the allowable error range compared with the pH value of buffer solution. Package List: 1 x Probe1 x Water Detector Electrode1 x Screwdriver1 x Instruction Note: Please allow 1-3cm error due to manual measurement. Thanks for your understanding.