A tachometer designed to operate by harmonic action of a reed(s).
NSN 5990-00-416-9831
NSN 5855-00-930-9478
NSN 6685-00-071-1072
NSN 5835-00-764-4388
NSN 5920-00-355-4736
NSN 5990-01-433-3786
NSN 5910-00-455-4517
NSN 4140-00-167-4712
NSN 5996-01-123-9038
NSN 5935-01-442-3426
NSN 5999-00-971-2361
NSN 6105-01-451-8440