It's an electronic measuring instrument that combines several measurement functions into one unit. At a minimum, it measures:
· Voltage (Volts, V): Electrical potential difference (AC & DC).
· Current (Amps, A): Flow of electricity (AC & DC).
· Resistance (Ohms, Ω): Opposition to current flow.
· Continuity: A quick "beep" test to check if a circuit is complete (often paired with resistance).