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Vintage James G. offerdle Company hand tachoscope, a mechanical precision instrument combining a revolution counter and stopwatch for measuring rotational speed (RPM).
Features dual analog dials, metal instrument housing, long shaft, detachable knurled handle, and original fitted carrying case with blue interior. Includes original offerdle instruction sheet dated March 1972 and the circular attachment shown.
The included instructions identify the long-handled version as Catalog No. 905, rated for measurements up to 10,000 RPM.
Used vintage condition with scratches, surface wear, aging, and discoloration. Carrying case has significant exterior edge wear and interior lining damage. Instrument has not been functionally tested or calibrated. Accuracy and operation are not guaranteed.
Includes only the items photographed. Please review all photos carefully.
The storage box is damaged on the left side.
