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For anywhere from two to ten bucks you can buy a very useful DMM from Harbor Freight.
Almost all the hand held digital meters I've seen are pretty much unrepairable. They don't even yield parts for the junkbox, except maybe a fuse and of course the test leads.
I own about six of the Harbor jobs, as well as a Fluke and a Tektronix. The Harbor ones are great because they are so cheap you don't care if one blows up. I only had one fail though, after a number of years. They are accurate and have some useful ranges. Not much good for low voltage AC though.
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