AUTOMATIC CALIBRATIONThe pH meter has an automatic temperature compensation function that adjusts to the temperature and water quality to give pH readings almost instantly. No need for adjustment screwdriver before use, just complete the calibration with the auto calibration button and the included calibration powders. [NOTE: Press the auto-calibration button to get accurate pH data before use] EASY, FAST & ACCURATEThe digital PH water quality meter is highly accurate for a measuring range of 0-14 PH, a resolution of 0.01 PH; Just remove the protective cap, immerse the pH meter electrode into the solution, turn on the PH by the "ON/OFF" switch; and read the result from the display, no need to work with color charts or test strips; Measure and display the pH result at the same time with the LCD display, reliable and fast reading. COMFORTABLE DESIGNFree extra 3 sets of PH calibration powder, easy to calibrate with the included pH 4.00 & 6.86 & 9.18 calibration powders, making it more accurate than test strips. Large backlit LCD display is easy to read. Pen style hand allows it to easily slip into your pocket or bag and accompany you everywhere. WIDE APPLICATIONThe pocket pH meter is the ideal test kit for home and laboratory uses; Suitable for testing the pH balance value of drinking water, swimming pool, aquariums, spas, hydroponics, food and wine; A very functional product to adapt to the pH value of any liquid to be measured.