High Quality & Durable: Highly accurate measuring range 0-14 PH, 0.01 PH resolution, working temperature: 0~60; Measures and displays 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; the 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 accuracy (0.01), and comprehensive pH measurement from 0 to 14! WIDELY USED: The pocket pH meter is an ideal test kit for home and laboratory use. Ideal for testing water, swimming pools, aquariums, spas, hydroponics, brewing food, wine and beer 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: 0.01 PH Accuracy: 0.01 pH Batteries: 2 x 1.5 V Operating Temperature: 0-60 Lifespan: Approx. 500 hours Dimensions: 15.5 x 3.1 x 1.8 cm Calibration Method: 1.Press on/off to turn on the power. 2.Dissolve each buffer solution in 250 ml of distilled water. 3.Immerse the electrode in 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 the calibration is accurate and can be used normally. If there is an error, repeat the calibration.