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.

Digital multimeters long ago replaced needle-based analog meters due to their ability to measure with greater accuracy, reliability and increased impedance.

Digital multimeters combine the testing capabilities of single-task meters—the voltmeter (for measuring volts), ammeter (amps) and ohmmeter (ohms). Often, they include several additional specialized features or advanced options. Technicians with specific needs, therefore, can seek out a model targeted to meet their needs.

The face of a digital multimeter typically includes four components:

• Display: Where measurement readouts can be viewed.
• Buttons: For selecting various functions; the options vary by model.
• Dial (or rotary switch): For selecting primary measurement values (volts, amps, ohms).
• Input jacks: Where test leads are inserted.