HIGH ACCURACY: The PH meter has a sensitive electrode sensor, simply press "ON", It only takes a few seconds for your result to appear on the screen. read accurate PH levels. The included detailed manual will show you how to get the best accurate and stable reading. EXTENSIVELY TESTED: Conveniently fits in your pocket or bag and goes anywhere. PH meter is an ideal option for families and laboratory testing PH value, which is suitable for the testing PH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; Appropriate for a wide range of applications. AUTOMATIC TEMPERATURE COMPENSATION: No more need to take care about the temperature of testing liquid, as the PH meter, has built-in (ATC) automatic temperature compensation so that it can accurately determine the PH value of the sample at any temperature in a range of 0C - 80C (32F - 176F). LIGHTWEIGHT AND EASY TO USE: Just remove the protective cap and immerse the PH meter electrode in the solution and press the button to be measured. Beats the heck out of trying to see the colours of a litmus strip. MAKE YOU SATISFIED WITH THE PRODUCTS: Come with 1x PH meter, 1x user manual, 2x 1.5V LR44 button cells(build-in), 3x PH Buffer Powders.