5-in-1 MULTI FUNCTION-This digital pH meter is designed with a 5-in-1 function, which is can be used to test the PH / TDS / EC / Salinity / Temperature of water. The measuring range is pH 0.00-14.00 (0.01PH accuracy), TDS 0-10000ppm, 10.1-200.00 ppt, EC 0-10000uS/cm, 10.1-19.99mS.20.1-400.0mS/cm, salinity 0.01%-25.00% and temperature 0-60. LCD GREEN BACKLIGHT DISPLAY DESIGN- This PH meter is designed with a clear LCD green backlight screen that displays the information in an intuitive layout. You can still read the digital even in a low visibility situation. With a handheld pocket size design, it is also convenient to carry out. And 5-minute auto-off design saves power and ensures battery life. HIGH ACCURACY PH TESTER- The glass probe of this pH tester is made of low-resistance glass sensitive film (25MQ), and the response speed is within 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 a solution of pH 4.01/6.86/9.18 to ensure the accuracy of the measurement. AUTOMATIC TEMPERATURE COMPENSATION & CALIBRATION- Liquid temperature may affect reading levels, but our digital pH water quality tester can accurately measure the pH value of the sample in the temperature range of 0C-60C / 32-140, and PH tester can automatically identify the calibration solutions to read the digital in a snap. WIDE APPLICATION- This 5-in-1 multi-functional 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 a vacation to ensure water safety in daily life. If you have any problem of the product, please don't hesitate to contact us