A multimeter or a multitester is an electronic measuring instrument that includes an ammeter, voltmeter, and ohmmeter. Analog multimeters are sometimes called volt-ohm-meters (VOM). Digital multimeters are sometimes called digital-multi-meters(DMM).

 

Multimeters are sometimes handheld and are useful for basic troubleshooting and field service work or a bench instrument that can measure with high accuracy. Bench instruments can be used to characterise resistance and voltage standards or adjust and verify the performance of multi-function calibrators.

 

Voltage, current and resistance measurements are considered standard features for multimeters. AVO multimeters get their name from amperes, volts, and ohms, the units that are used for the measurement of current, voltage, and resistance.

 

Multimeters can be used to troubleshoot electrical problems of household devices such as dead batteries, washing and drying machines, kitchen appliances, and even automobile electronics and electrical systems.