It's a must-have for any toolbox—but there's a learning curve involved. Learn how to use a multimeter for all of your electrical testing needs.

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The multimeter should now display a reading of 120 volts or slightly above. You've now confirmed that house electrical power (120 volts AC current) is reaching the switch, coming from the wire on ...

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Reading a multimeter Read the number on the multimeter screen while holding the probes in place. In the US, a reading should be between 114 and 126 volts (120v +/- 5%) for an outlet to work properly.