Workpieces a being inspected are moved along circular surface b of the base by continuously revolving wheel 1. If workpiece a is oversize it will deflect lever 2 when it passes under the sharp measuring edge of the lever. Lever 2 turns about fixed axis A and, when deflected, its latch c releases cover 3 of hatch d. Thus oversize workpieces drop through hatch d. If workpiece a is undersize it passes freely under lever 2 and drops through the next hatch e which is too small for workpieces of the proper size. Workpieces of the proper size pass hatches d and e and drop through hatch f. In this way, the workpieces are sorted into three size groups.
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