digital multimeter
On the multimeter, you will see the conversion knob as shown in the figure, and the knob refers to the gear of the secondary quantity.
V~: Indicates the gear of measuring AC voltage.
V-: Indicates the level of DC voltage measurement.
MA: Indicates the gear of measuring DC voltage.
Ω(R): Indicates the gear of measuring resistance.
HFE: Indicates the gear of measuring resistance.
The red pen of the multimeter represents the positive pole of the external circuit, and the black pen represents the negative pole of the external circuit.
