A tachometer designed to operate by harmonic action of a reed(s).
NSN 4140-00-975-5070
NSN 6150-01-541-4029
NSN 6650-01-481-1165
NSN 5855-00-586-6255
NSN 6135-00-078-9931
NSN 6645-00-853-0073
NSN 6220-01-142-3688
NSN 6150-00-768-9848
NSN 5895-00-518-1593
NSN 6130-00-435-9473
NSN 5965-01-104-5102
NSN 5998-01-498-3655