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Beckman Circuitmate DM-73 Battery Cover Door
I've had this great little handheld meter since not long after high school (longer ago than I care to mention). You see them pop up on eBay from time to time, and I've purchased a backup, but the latches on the battery door are a weak point in the design. For 20+ years, I've had to put up with mine falling off, but I decided to make a faithful recreation today.