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Also known as a multitester, or a VOM (Volt-Ohm meter), a multimeter is an electronic measuring instrument used to measure voltage, current, and resistance. Includes handheld and tabletop testing devices.

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MastTech MS8229 beeps all the time

Hi I own a MS8229 multimeter for a few years now. It works fairly well except the one (super annoying) thing it does is it beeps whenever it is turned to a current/voltage/resistance measurement. It doesn't matter if the probes are plugged in or not. The beep differs (deeper beep) if the probes aren't plugged in but then it's a high pitched beep when they are removed. The beep goes away if I change it measure lux/audio, etc…

So wondering how/if this can be debugged. I'm also thinking to disconnect the speaker as it's terribly loud. Is there a suggestion one what I can do to fix this? I'm thinking of clipping the speaker but that seems like a worst-case scenario. I'd hate to throw this device away.


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Try opening and cleaning it up thoroughly. If you haven’t done it in some time, corrosion maybe causing current fluctuations, which makes the meter beep or buzz.

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The contacts in the unfused port might be touching or shorted by something inside. I would use gently use a wooden chopstick to see if you can separate the contacts inside the port and see if that helps. I had this recently after cleaning my multimeter and accidentally nudged the contacts together.

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Where's the unfused port?

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