LCD GREEN BACKLIT DISPLAY DESIGN- This PH meter is designed with a bright green backlight LCD screen that displays information in an intuitive layout. You can still read digital even in low visibility situation. With a portable pocket design, it is also convenient to carry. And the 5 minutes automatic shutdown design saves power and ensures battery life. HIGH PRECISION PH TESTER - The glass probe of this pH tester is made of low resistance glass sensitive film (25MQ), and the response speed is 0.1 seconds. TDS electrodes are made of agile, high-quality titanium alloy with perfect corrosion resistance. The pH meter adopts a three-point calibration method to calibrate the electrode to pH 4.01/6.86/9.18 solution to ensure the measurement accuracy. WIDE APPLICATION- This 5 in 1 multifunctional pH tester is ideal for home and laboratory pH testing applications, which can be used to test the quality of drinking water, swimming pools, aquariums, hot springs , aquaculture, ponds, and well water indoors or during vacations to ensure water safety in daily life.