SINOCMP 0-6"/150mm Stainless Steel Digital Electronic Caliper Economy Model, Digital Vernier Caliper SINOCMP Small locking thumb screw which locks the jaws in place Measures inside, outside and depth from 0 inch to 6" or 0Mm to 150Mm High quality stainless Steel with led display Higher quality lower price stainless steel digital caliper with inch/metric/fraction conversion Home DIY and professional use are both highly recommended