They made these in the early 1950s. The EV10A differes from the earlier EV10S as the schematics are completely different and yours could have came with an RF probe with had a 9002 miniature tube in it. It allowed a voltage measurement of up 60 KV! Lazy Electrons has a site showing how he restored his EV10A. Prayers for your wife's speedy recovery Sam. Steve from IL
Precision Apparatus Co made instruments with odd combinations of tester functions. Take the Precision Model 612 tube tester. Not only does it tests tubes, but it also tests "condensers" (caps) and dry cell batteries. Prayers for your wife's quick recovery....
