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A multimeter is a handy tool, but only if you know or learn how to use it safely and how to interpret the results. Otherwise, it can lead you astray and potentially be dangerous, depending on what you're measuring, and how you're doing it. A decent one doesn't have to cost a whole lot, but high quality ones with lots of useful extra features (like acv or dcv current measuring) can start to be, and may not be worth it for the average user.
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