A tachometer designed to operate by harmonic action of a reed(s).
NSN 7035-00-763-6180
NSN 2925-00-420-8151
NSN 5975-00-001-5535
NSN 5965-01-360-4329
NSN 5945-01-432-1139
NSN 5998-01-317-1201
NSN 6150-00-377-3926
NSN 5950-00-134-6554
NSN 5855-01-100-3272
NSN 6150-01-659-1037
NSN 6220-01-289-5808
NSN 6150-01-374-7540