This is not about what value to set it at, but about a good practice to avoid accidents. Use 2 clamps on your Multimeter.
Connect the black one to a GND on your printer. Easy to use is directly from PSU or from a GND from endstop pins.
Attach the red one to a small screw-driver fitting for your trimpot.
This way you have your hands free to actually adjust the trimpot and not having to hold multiple wires and worry about something slipping and making a short circuit somewhere:
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