Digital LCD TDS Meter Waterfilter Tester for Measuring TDS3/TEMP/PPM

--Remove the pen holder and turn on the ON switch.

--Put the pen into the test solution, the height of the solution should not exceed 2cm.

--Stir the pen in the solution. After the reading is stable (2-6 seconds), the TDS value will be displayed on the screen. Press the HOLD button to lock the value.

--After use, wipe the water on the tip of the pen, clean it with pure water, and cover the pen cover.