LARGE EASY TO READ BACKLIT LCD DISPLAY: The water quality meter, with a large backlit LCD display, is far superior to other displays, allowing wider data reading and nighttime reading angles. Wide Range of Uses: The pocket pH meter is an ideal pH tester for water, swimming pools, aquariums, hot springs, hydroponics, food, wine and beer making. Fast and Accurate: Ensure your drinking water, swimming pool and regular hydroponic pH have perfect pH balance and can be used with an accurate pH tester. The PH water meter has a sensitive electrode sensor, which can read the accurate PH value. Automatic temperature compensation: there is no need to worry about the temperature of the liquid to be tested, because the PH tester has a built-in automatic temperature compensation (ATC) function, which can determine with accurately the pH value of the sample. Easy Calibration: The PH pen has an automatic temperature compensation function, which can be adjusted according to temperature and water quality, and can provide PH reading almost immediately. The tester can also use buffer powder for testing.