Vantacool Digital PH Meter, PH Tester with ATC,Water Quality Tester 0.01pH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution Measure Household Drinking Water (YELLOW) WIDE 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 FAST AND ACCURATE: No need to work with color charts or messy test strips, this meter get the result fast and accurate. It with 0.01 resolution, 0.05 accuracy, full pH 0-14 measurements! EASY CALIBRATION: No need any adjustment screwdrivers, just press a button to finish the calibration. (Note: This ph meter is factory calibrated. Users can use it directly.) AUTOMATIC TEMPERATURE COMPENSATIO: ATC accounts for changes in temperature automatically MAKE YOU SATISFIED WITH THE PRODUCTS: Come with 1x VANTAKOOL PH meter, 1x user manual, 2x 1.5V LR44 button cells(build-in); 1-Year Warranty