A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms). It is a standard diagnostic tool for technicians in the electrical/electronic industries.
How many functions can a multimeter do?
Multimeters are covered in cryptic symbols and buttons, but don't let that intimidate you. There are three basic functions you'll use most often: measuring voltage, continuity and resistance in electrical components and circuits.