[High quality and durable] measuring range 0-14 pH, resolution 0.01 pH, working temperature: 0 ~ 60 , high accuracy of measurement; The pH value is measured and displayed simultaneously on the LCD screen, and playback is reliable and fast. [Easy to use] Simply remove the protective cap, to immerse the pH-meter electrode in the solution and turn on the pH by the "ON / OFF switch "For the measurement. Beat the demon and try to see the color of a sunflower bouquet. [Automatic calibration] The pH meter has an automatic temperature compensation function, which can adapt to the temperature of the water and the quality of the water, and obtain A pH reading almost immediately. In addition, you can use the buffer powder to calibrate the tester with a single button. [widely used] The pocket pH meter is an ideal test kit for home and laboratory use. Ideal for testing water, pools, aquariums, spas, hydroponic culture, food, wine and beer, etc. 1. Turn on the pH meter and clean the electrode with distilled water. 2. Immerse the electrode in a standard pH 6.86 buffer solution. 3. Press the "CAL" button. Wait until the figure shows that the pH is stable at 6.86. 4. Clean the electrode with distilled water and dry it, plunge the electrode into the standard pH 4.00 buffer solution. 5. Press the "CAL" button. Wait until the number displays 4.00 pH. Then finish the Calibration of the pH 4.00. 6. Clean and dry the electrode and place the instrument in the standard pH 9,18 buffer solution. Check if playback between 9.17 and 9.19 pH is correct. what you need to know: The pH meter uses very fragile electrodes for tests. Therefore, the pH meter should be used carefully to avoid a collision. If the parcel is received, the screen will not light. Possible situations are as follows: The battery is not tight: You can try to check if the battery is properly installed and tight. Quantity delivered: 1 piece