This pen-type pH meter is professional and useful water quality tool for testing pH and temperature of the solution level. Suitable for aquarium pool, drinking water and environment water. Compact light and portable pen-type design.   Features: Great to measure the pH level & temperature of solution/water.  Imported control chip & full waterproof imported ATC sensor - more durable.  ATC function(Automatic temperature compensation) and backlight LCD display.  Zero power consumption when the pH meter shutdowns - more power-saving.  Imported smart IC ensures high cost performance & high stability.  Test temperature in ℃ / ℉(switchable unit).  Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems.  Very wide variety of applications, used for testing the acidity and alkaline levels of almost any liquid.  CE, FCC and RoHS certificated to offer safer and precise measurement.   Specifications: Mode: pH-007I;  Range: pH 0.00-14.00, Temperature 0℃-50℃ (32℉-122℉);  Resolution: pH 0.01PH, Temperature 0.1℃ (0.2℉);  Accuracy: ±0.02pH, Temperature ±1.0℃;  Operating Temperature: 0℃ ～ 50℃ (32℉ ～ 122℉);  Temperature Compensation: 0°C ～ 50℃ (32℉ ～ 122℉);  Battery: 1×3V (CR2032) Button Cell Battery (NOT Included);  Color: Red + Black;  Material: ABS;  Function: ATC, 5 Minutes Automatic Shutdown, Low Battery Warning, Battery Level Display, 3 Calibration Points;  Item Size: Approx. 15 * 3.1 * 1.8cm / 5.9 * 1.2 * 0.7in;  Item Weight: Approx. 46.1g / 1.6oz;  Package Size: Approx. 18 * 7 * 3cm / 7.1 * 2.8 * 1.2in;  Package Weight: Approx. 99.5g / 3.5oz;   Note: Long press 2 seconds the button to switch power.  pH-007I can automatically identify standard buffer solution of pH4.00、pH9.18 and pH6.86.   Package List: 1 * pH Meter (Battery is not included);  1 * User Manual