Power supply two 1.5 v aa batteries, one 9v alkaline battery
No other part numbers with same form, fit, and function found.
An instrument which displays, in units of revolutions per minute, the transmitted rotational speed of a shaft for a specified elapsed time.
Classification: Parts and accessories for revolution counters, production counters, taximeters, odometers, pedometers and the like
NSN 6110-01-094-3907
NSN 6110-01-633-9660
NSN 6145-01-331-2386
NSN 6240-01-633-9357
NSN 5998-00-130-5604
NSN 5925-01-133-8453
NSN 5910-00-204-8497
NSN 6320-00-468-8421
NSN 5935-00-567-1008
NSN 6240-01-219-1375
NSN 6135-01-581-8843
NSN 5895-01-062-1792