HIGH ACCURACY pH METER: This pH meter uses a sensitive glass bulb electrode sensor to provide accurate pH readings in the 0-14.0 measurement range. This pH tester kit with 0.01 resolution delivers precise results. AUTOMATIC CALIBRATION: The pH meter features an automatic calibration function adjusted for water temperature and quality. Stable pH readings are available within a few seconds. You can calibrate the tester with the one-touch CAL button using Calibration Buffer Powder. AUTOMATIC TEMPERATURE COMPENSATION: The unit has a built-in temperature sensor. When the sample solution temperature differs from the standard solution, the automatic temperature compensation system (ATC) adjusts to measure the pH value at 0°C-80°C (32°F-176°F). PORTABILITY AND APPLICATIONS: Designed to fit conveniently in a pocket or bag. Suitable for families and laboratories, it tests pH levels in drinking water, pools, aquariums, RO systems, spas, and hydroponics. Appropriate for a wide range of applications. COMPLETE ACCESSORIES: Comes with 1x pH meter, 1x user manual, 2x 1.5V LR44 button cells (built-in), and 3x pH Buffer Powders. The enclosed manual shows how to obtain accurate and stable readings.