Caliper -- Dial Caliper O Gauge

Dial caliper, O gauge version of #285-142. One turn reads four HO feet and inches. Bar reads O and HO for cross-references. English and metric conversion on back. Dial is graduated in 1/2" and 1" gradations. Capacity Zero to 24 scale feet. Easy-to-read dial measures 4ft. 0 inches per revolution.