Hard to find. In as found condition.
Vintage Allen Battery Cell Tester #E-51C Allen Electric & Equipment Co.
Vintage ALLEN Compression Tester Gauge With Metal Box And Accessories
Vintage Allen USA Compression Tester Not tested Parts only
Vintage Allen Tune Dwell Tachometer Tester Untested
Vintage Allen Tune Dwell Tachometer
Vintage Allen Tune Timing Light Atomic Age MCM Ray Gun 1950s Untested 50-507
