HIGH ACCURACY: PH tester has a sensitive electrode sensor ,simply press "ON", It only takes a few seconds for your result to appear on screen.read accurate pH levels. The included detailed manual will show you how to get the best accurate and stable reading. WIDELY USE: Ideal for household or laboratory use; Suitable for testing pH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; Appropriate for wide range of applications AUTOMATIC TEMPERATURE COMPENSATION: No more need to take care about the temperature of testing liquid, as ph meter has built in (ATC) automatic temperature compensation, so that it can accurately determine pH value of the sample at any temperature in a range of 0C - 80C (32F - 176F) Make You Satisfied With The Products: Come with 1x PH meter, 1x user manual, 3x 1.5V LR44 button cells(build-in), 3x PH Buffer Powders. 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 colors of a litmus strip.