High quality and durable: Highly accurate measuring range 0-14 PH, resolution 0.01 PH, working temperature: 0 ℃ ~ 60 ℃; measure and display pH results, LCD display, reading is reliable and fast. Readings are fast and accurate: just turn on the device, dive into the LCD screen to read, no need to use color charts or test strips; large LCD screen makes it easy to read. Accurate: The instrument's measurement results are fast and accurate, with a resolution of 0.01, high precision (0.01), and comprehensive pH measurement from 0 to 14! WIDE USE: The pocket pH meter is an ideal test kit for home and laboratory use. Ideal for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and beer brewing and more. Automatic Calibration: No need to adjust the screwdriver, just use the automatic calibration button to complete the calibration and contains buffer powder. Feature: Material: High quality ABS Screen: Digital LCD display Probe type: Precision glass ball electrode Calibration method: Automatic calibration Measuring range: 0.00 -14.00 PH Resolution: 0.01PH Accuracy: 0.01 pH Batteries: 2 x 1.5V Operating temperature: 0-60 ℃ Lifespan: Approx. 500 hours Dimensions: 15.5 x 3.1 x 1.8cmCalibration method: 1.Press on/off to turn on the power. 2.Dissolve each buffer solution in 250 ml of distilled water. 3.Dip the electrode into the PH 6.86 solution (at a temperature of 25 ). Press the "CAL" button for 5 seconds and release. The display starts flashing 6.86 The display stops flashing and the screen displays "End" Rinse the electrode with distilled water and dry it with filter paper. 4. Dip the electrode into the PH 4.01 solution (at a temperature of 25 ). Press the "CAL" button for 5 seconds, then press and release immediately the second time The display starts flashing 4.01 The display stops flashing and the screen displays "End" Rinse the electrode with distilled water and dry it with filter paper (2-point calibration is complete) 5. After the calibration is completed, place it in the solution of known value to be detected. If the displayed value is within the error range, it means that the calibration is accurate and can be used normally. If there is an error, repeat the calibration. 6. If you know that the approximate pH of the test solution is higher than 7.0, calibrate the tool using the 6.86 and 9.18 solution. To do this, please follow the calibration table. The third step is the 9.18-point calibration method. Note: The data are all measured manually, please allow 1-3cm error, due to differences in light and display, there may be some color differences, please refer to the actual item received.