Do you want to know whether the pH value of water you drink is up to the standard? If so, this pen-type pH meter is what you need. Featuring the automatic temperature compensation which will automatically compensate the solution temperature of 0～70℃, it can provide you the accurate and stable reading. NOTE: The calibration powder is NOT included! Customers can buy the calibration powder to calibrate by themselves. Specifications: Material: ABS Plastic Color: Grey Testing Range: pH: 0.00～14.00pH, TEMP: 0℃ ～ 60℃ Resolution: 0.01pH Accuracy: ±0.05pH Repeatability: ± 0.01 Operating Temperature: 0℃ ～ 50℃, ≤80%RH Automatic Temperature Compensation: 0℃ ～ 70℃   Calibration: 2 Points Automatic Calibration Power: 2 * 1.5V AAA Battery (NOT Included) Item Size: Approx. 175 * 45 * 45mm / 6.9 * 1.8 * 1.8in Item Weight: Approx. 87g / 3.1oz Package List: 1 * pH Meter (Battery is not included) 1 * Storage Bag 1 * User Manual