Series 530 FEATURES Measures OD (outside diameter), ID (inside diameter), depth, and steps. The small vernier face angle (14°) provides easy reading. Dual reading scales on vernier. (metric/inch and inch models only) Lock screw for holding thesliding jaw position. Carbide-tipped jaw type calipers are also available. Supplied with vinyl holster in fitted carton. Except 600mm / 24” models are carton only. 1000mm / 40” supplied in wooden case.