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 6130-01-023-8031
NSN 5895-00-467-1140
NSN 6110-01-220-9352
NSN 6110-01-424-0612
NSN 6110-01-418-7761
NSN 6145-01-507-1649
NSN 5965-01-449-2794
NSN 5985-01-228-7408
NSN 6240-01-429-2747
NSN 5895-01-546-2805
NSN 5998-01-550-2031
NSN 6135-01-205-5965