A tachometer designed to operate by harmonic action of a reed(s).
NSN 6150-00-353-1403
NSN 6130-01-503-5490
NSN 6320-01-627-1594
NSN 6240-00-141-6143
NSN 6150-01-213-9034
NSN 6135-00-455-2425
NSN 6320-01-132-2746
NSN 7035-01-310-2587
NSN 5915-01-209-1015
NSN 6645-01-501-0576
NSN 6145-00-170-9415
NSN 4140-00-776-8237