ph meter is the perfect device for determining the acidity or alkalinity of liquids. It is extremely easy to use (just If you immerse the electrode in a liquid) and the measurements are automatically displayed. With the resolution of 0.01 pH, you can achieve greater accuracy than other pH meters. The electrode is designed with more durability to provide a longer product life. Automatic calibration: no need for any screwdriver adjustment, just finish it. calibration with automatic calibration button and powder buffer. PH meter specifications: Display: LCD screen Measuring range: 0.00 - 14 .00 pH Resolution: 0.01 pH Accuracy: 0.01 pH Applied range: producing and drinking purified water , electroplating liquid, boiler water, water in an aquarium, water from swimming pools, photo rinsing liquid, well water, deep phreatic water, laboratories, aquaculture, food processing, etc. Operation 1. Remove the protective cover, firstly, dispose of the pH meter electrode in distilled water, then dry it by the filter paper. 2. Open the pH meter switch located above the battery attic. 3. Place the pH electrode in the solution until it reaches the pH level. the solution approaches the immersion line or slightly exceeds it; Lightly mix the solution until smooth. The number is stable, then read the displayed number. (After use, turn off the pH meter and remove the batteries. Use distilled water to clean the pH meter. electrode and replace the protective cap.) Package including: 1x PH Digital Pen 1x Instructions for use 6x Calibration Powder(2x pH 4.00, 2x pH 6.86,2x pH 9.18) 6x 1.5V button battery Our batteries are new. To avoid soaking the battery in water.