Multimeter

A special electrical meter that is often used to make multiple electrical tests, hence the name. Most multimeters can test for AC and DC voltage, current (amperage), and resistance. More expensive meters generally offer higher precision and advanced functionality such as the ability to check temperature (pyrometer) or engine speed (tachometer). There are two basic types of multimeter, analog (with a needle that moves across the meter face) and digital. Digital meters are generally more accurate and easier to use, and are preferred by most technicians.