A multimeter is a test instrument used to measure electrical values. Most multimeters can measure voltage, current, resistance, and continuity, and some can also test diodes, capacitors, temperature, or frequency.
Why a multimeter is important
A multimeter helps find broken wires, dead batteries, wrong polarity, short circuits, open circuits, and components that are out of range. It is one of the most useful tools for electronics troubleshooting.
Basic safety note
Voltage, current, and resistance measurements use different settings and sometimes different probe ports. Measuring current incorrectly can damage the meter or circuit.
For beginners, a multimeter is the main tool for turning guesses into measurements.