A tachometer designed to operate by harmonic action of a reed(s).
NSN 4140-01-560-6489
NSN 6150-01-194-6001
NSN 6150-00-089-4271
NSN 5950-01-065-0858
NSN 6650-01-633-9147
NSN 5998-00-847-8696
NSN 6645-01-272-6987
NSN 5930-01-561-1777
NSN 6130-00-443-4967
NSN 5910-01-341-8418
NSN 5920-01-027-0660
NSN 5855-01-254-3041