Vintage Automotive Electronic Testers

[Ray’s Autoshop]

Hello. I have a few electronic testers that belonged to my Grandfather when he owned an automotive repair shop during the 40-80's. I think I know how the Marquette unit is used, but do not know much about the Electric Auto-Lite or Weidenhoff. Is anyone here familiar with the two latter?

 

[Schurkey]

Seem to be two different takes on lower-amperage Volt--Ammeters. Probably DC only.

I bet they were useful for generator/alternator testing before alternators were commonly more powerful than 60 ampere output. They'd never have been useful for starter testing as starters commonly require 120--200 amperes of current. OTOH, at least one of them suggests that external shunts were available for ampere loads beyond the capacity of the meter itself.

Nice "Man-Cave art" now. Not really practical as actual tools any more; although it wouldn't surprise me that they could be rejuvenated with fresh capacitors and resistors, and someone clever enough to verify/adjust the calibration.