Automatic calibration: 2-point automatic calibration, automatic identification of standard liquid, 5 seconds for full calibration. Automatic temperature calibration: do not worry about the effect of temperature change on the pH, the pH value will automatically adjust the temperature. Easy to use: just remove the cover and immerse the electrode of the pH meter in the solution and press the button to measure. Fast: The sensitive sensor connects directly with the tested solution, fast and accurate. Waterproof: Large LCD screen with excellent waterproof performance allows you to read easily the displayed value. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain difference in color, depending on the physical object received Delivery Quantity: (according to the main picture)