Multimeters are tools used to troubleshoot electrical and electronic circuits. They are also used to check voltages to ensure correct operating levels. The most common models measure voltage, current and resistance. A meter is a measuring instrument. An ammeter measures current; a voltmeter measures the voltage between two points; and an ohmmeter measures resistance. A multimeter combines these functions into a single instrument. A multimeter can be used to measure voltage, current and resistance in an electrical circuit that uses resistors and capacitors. This is the Philips GM8058.