5-IN-1 MULTIFUNCTION- This digital PH meter is equipped with 5-in-1 function, which can test PH/TDS/EC/Salinity/Temperature of water. PH meter measuring range is pH 0.00-14.00 (0.01PH accuracy), TDS 0-10000ppm, 10.1-200.00ppt, EC 0-10000uS/cm, 10.1-19.99mS.20 ,1-400.0mS/cm, salinity 0.01%-25.00% and PH meter pool temperature 0-60. GREEN BACKLIGHT LCD DESIGN - This PH meter is Equipped with a clear green backlit LCD screen that displays the information in an intuitive layout. You can read the digital image even in poor visibility. With a pocket-sized portable design, it is also convenient to carry out. PH meter and 5-minute auto-off design saves power and ensures battery life. HIGH ACCURACY PH TESTER - The glass probe of this PH meter is made of low resistance glass sensitive film ( 25 MQ) and the response speed is within 0.1 seconds. TDS electrodes are made of a flexible, high-quality titanium alloy with perfect corrosion resistance. The pH meter uses a three-point calibration method to calibrate the electrode to pH 4.01/6.86/9.18 solution to ensure the accuracy of the measurement. AUTOMATIC TEMPERATURE COMPENSATION &amp ; CALIBRATION- PH meter liquid temperature may affect the readings, but our digital PH water quality tester can accurately measure the pH of the sample in the temperature range of 0-60/32-140 and the PH value pool meter can automatically identify the calibration solutions to read the digital display in a snap. WIDE APPLICATION - This multifunctional 5-in-1 PH meter is ideal for home and laboratory pH testing applications, with which the quality of drinking water, swimming pools, aquariums, hot springs, aquaculture, ponds, and well water indoors or on vacation, to ensure water safety in daily life.