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. Features: Test the pH level and temperature of solution/water with data hold function. Pocket size lightweight and portable with switchable backlight & large LCD display for clear reading. Replaceable pH sensor probe - The electrode probe can be replaced with insert type design for convenient and fast replacement. ATC function (automatic temperature compensation) automatic calibration and IP65 fully waterproof design. Apply in water sources soil-free growing aquarium hydroponics laboratory spas swimming pools and other water systems. 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: 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