Specification:Condition: 100% Brand New Item Type: pH Meter Material: Plastic Working Temperature: 0-50℃ RH＜95% (32-122℉) Measuring pH Range: 0.0-14.0pH Resolution: 0.1pH Accuracy: ±0.2pH (at 20℃) / ±0.2pH Battery: 4 x 1.5V Button Battery (Not Included) Product Size: Approx. 3.1 x 1.6 x 15 cm / 1.2 x 0.6 x 5.9 in Weight: Approx. 120g / 4.2oz Operating Steps: 1. Remove the protective cover. 2. Firstly, the electrode of the pH meter should be cleaned with distilled water, and wipe the electrode with filter paper. 3. Turn on the power button located on the battery compartment. 4. Insert the pH meter into the liquid to be measured until the liquid is immersed in the ''immersion line''. If condition allowed, the solution can be immersed slightly above the ''immersion line''. 5. Stir the solution gently and wait for about two minutes, and then read the displayed value. 6. After use, the electrode should be cleaned, turn off the power and put on the protective cover. Package List:1 x pH Meter (Battery Not Included)1 x User Manual2 x pH Calibration Powder1 x Screwdriver Note:1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Features Waterproof metal electrode and high quality material, not easy to break and durable in use. Suitable for measuring the pH value of aquarium, fishing, swimming pool, school laboratory, food and beverage. Compact structure, lightweight and portable, easy to carry and convenient for indoor and outdoor use. Easy to use and operate, just insert the probe into the liquid and press the button for pH testing. This digital pH meter Features high accuracy, stable measurement, high reliable and excellent performance.