接触式分划板，34.70mm直径，厚薄/孔规

A series of parallel lines 0.001" to 0.008" apart measure thickness.
10mm metric scale is divided into units of 0.2mm.
0.5" decimals-inch scale divided into units of 0.005".
Hole Diameter scales read in fractions of 1/64" to 1/16" and decimal scale from 0.005" to 0.05".