A multimeter is an instrument that is designed to measure electric current, voltage, and resistance. The values can range from around mili- to kilo-. If you are on a current setting that is measuring too high then it will beep and you can normally change it to another setting that will be able to handle the current. The beep is also saying that the wire would not be safe and it could possibly blow the circuit. Electricians use these multimeters to find live wires and dead wires, along with figuring out what the source of a problem is. We can use the multimeter as a more accurate way to measure wires rather than assuming that the labels on things are right and using math.
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