A tachometer designed to operate by harmonic action of a reed(s).
NSN 6110-01-423-8246
NSN 5975-00-571-4143
NSN 5950-00-001-3256
NSN 5935-00-237-2524
NSN 6110-01-162-6098
NSN 5920-01-418-1821
NSN 2925-01-100-3694
NSN 5950-01-037-7440
NSN 6685-01-570-5707
NSN 6130-01-517-2151
NSN 6240-00-872-3365
NSN 6645-00-819-5045