Digital pH Meter: It has a large range of -2.00-16.00, and the use scene is wider. Backlight display, the color of the display backlight of the pH meter will change according to the pH value, just like pH test strips. TDS or EC or Temp Meter: 3-in-1 digital water quality tester that provides accurate readings of TDS (Total Dissolved Solids), EC (Conductivity), and Temperature, professional, accurate, and precise 3-in-1 TDS or EC or Temp meter. Automatic temperature compensation: Both the pH meter and the 3-in-1 water quality tester have an ATC function, which can reduce the error caused by the change in solution temperature. Easy to use: Rinse the electrodes of the pH meter or TDS tester with pure water first, wipe dry with a cloth or filter paper, turn on the meter put it into the solution to be tested, and stir gently, wait for about 30 seconds until the reading is stable to obtain the test value. Wide Application: Ideal tester for any aquarium, aquaculture, swimming pool, spa, school laboratory, food andamp and beverage, drinking water, etc.