A tachometer designed to operate by harmonic action of a reed(s).
NSN 6650-01-057-6468
NSN 5905-01-029-0870
NSN 6645-01-393-5128
NSN 5998-00-004-3832
NSN 5855-00-631-4565
NSN 6135-00-223-9563
NSN 6685-01-576-2856
NSN 5930-01-244-2387
NSN 5950-00-521-8432
NSN 6105-01-183-5509
NSN 5925-01-459-4686
NSN 6145-01-653-9342