A multimeter or a multitester, also known as a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter can measure voltage, current, and resistance. Analog multimeters use a microammeter with a moving pointer to display readings.

Multimeters should never be used to test the electrical properties of explosive circuits due to the potential for accidental initiation.

See also Megger tester