1. Just press \"ON\", it only takes a few seconds for your result to appear on the LED screen, with accurate measurement and clear display. The backlight function ensures that you can use the product in a dimly lit working environment.2. High-precision electrode chip and laboratory-grade glass electrode ensure accurate and fast response. Measures 0 ~ 14 pH range with a high resolution of 0.01 pH.3. Press \"CAL\" for 5 seconds to enter calibration mode, press in turn to select the powders corresponding to 6.86, 4.00 and 9.18 to complete the calibration.4. The PH tester has ATC function, so it can be adjusted according to the water temperature to provide pH readings almost immediately.5. PH meter for measuring pH in your pool and spa; Ideal for residential or commercial use, drinking water, aquarium, liquid food, brewing, RO systems and hydroponics.6. Comes with protective case, lightweight, handheld design for portability and convenience. What you get: 1x PH meter, 1x user manual, 2x 1.5V LR44 button cells (built-in), 3x pH buffer powders.