How to use the TDS detection pen
1. Remove the pen cap, press the switch button, and fill 2/3 of the pen cap with the water to be tested.
2. Put the pen into the water to be tested and stir gently
3. Wait for the reading to stabilize and watch the value on the display.
4. After use, dry or wipe the water on the pen tip, cover the pen cap back, and turn off the power
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