A tachometer designed to operate by harmonic action of a reed(s).
NSN 6130-01-451-9094
NSN 6610-01-238-5559
NSN 5945-01-204-1978
NSN 5920-01-157-9471
NSN 5925-01-442-8589
NSN 6645-01-182-4896
NSN 5950-01-123-8323
NSN 6320-01-054-3046
NSN 5895-01-442-5391
NSN 5935-01-539-5859
NSN 5985-01-474-4409
NSN 5915-00-506-7515