The Mitutoyo536-148Vernier Point Jaw Type Inside Caliper has the following specifications: Range: 70-450mm Graduations: 0.05mm Accuracy: +/- 0.10mm Mass(g): 1,250 Remarks: Point Jaw Type Features: Specially designed for inside measurements in hard-to-reach places Supplied in fitted plastic case. 18"/450mm and 24"/600mm supplied in wooden case.