A multimeter — a little digital box with a couple of wired probes ... replacing your most expensive appliance parts. Read ...

There is still one thing affordable multimeters remain unable to do: they can’t log their readings for analysis on a computer. They’re an instantaneous instrument, just as they always have been.

When electrical issues arise, these quick receptacle power tests will come in handy. Learn how to measure voltage, conduct a polarity test, and more. Ever wonder whether power is reaching an outlet?