Terms of the Trade: What Is an Ohmmeter?

An ohmmeter is a handheld device that measures electrical resistance. Resistance is expressed in ohms. To use an ohmmeter, you must turn off power in the circuit you are testing, use provided plugs to plug into the socket on your meter, zero out the meter, touch one probe to a circuit and the other to the other end, and read the resistance. An ohmmeter can help you detect problems in systems like your car's electrical system.