A tachometer designed to operate by harmonic action of a reed(s).
NSN 6135-01-062-9356
NSN 5835-01-379-1407
NSN 6135-00-299-6918
NSN 6220-01-428-3960
NSN 5996-01-261-2303
NSN 4140-01-392-9568
NSN 6685-01-264-8769
NSN 5965-01-517-2000
NSN 6610-01-483-1317
NSN 5960-01-076-3936
NSN 6135-01-180-9611
NSN 7035-01-295-1609