A tachometer designed to operate by harmonic action of a reed(s).
NSN 6110-00-510-1607
NSN 5950-01-466-4209
NSN 6150-01-607-7462
NSN 4140-01-492-6734
NSN 6240-01-327-3239
NSN 5930-01-109-1180
NSN 6650-01-633-9147
NSN 5910-01-305-6440
NSN 2925-01-224-1885
NSN 6620-01-372-4168
NSN 6105-01-140-6327
NSN 6130-00-905-9936