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 #xff5e;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 #xff5e;14.00pH, TEMP: 0 #xff5e; 60 Resolution: 0.01pH Accuracy: 0.05pH Repeatability: 0.01 Operating Temperature: 0 #xff5e; 50, 80%RH Automatic Temperature Compensation: 0 #xff5e; 70 Calibration: 2 Points Automatic Calibration Power: 4 * 1.5V LR44 Button Cell 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