This is perhaps the oldest piece of electronic test equipment that I own, and I found it in October 2022 for $12 at one of my favorite consignment shops in Downtown Akron.

This Micronta Multitester, RadioShack Cat. No. 22-201A, was manufactured sometime in November of 1976, judging by the sticker marked "11A6" near the battery compartment, and the instruction sheet was revised sometime in July 1976. It requires only one AA battery for the three ohmmeter settings, which are x1, x10, and x1000 (x1K), and the rest of the settings can be run without a battery. On the back of the manual, a schematic diagram is given, which you just don't see anymore in any user's manual; these days, you'd be extremely fortunate enough if any manufacturer was willing to sell you a complete repair guide.

When I brought it home and inspected it, I saw that there was a piece of the selector switch wiper arm broken off, so I fashioned a replacement prong out of an ordinary staple and soldered it in the missing prong's place. There was a small amount of battery corrosion on the negative battery terminal, which was easily removed with a vinegar-soaked cotton swab. The battery that was included was a relatively new one, so I didn't have to worry too much about replacing it. There was also some light filth on the contact pads for the selector switch, and the filth was easily removed with a cotton swab soaked with 91% isopropyl alcohol.

Although I don't plan on making this multimeter my daily driver (I have my GB Instruments GMT-318 for that), it is a nice piece of vintage tech to add to my collection.