Steel chrome plated model. One side graduated in inches for 6 inch and other side graduated in millimeters for 15 cm and the 10-part Vernier reads to 0.1mm. The moveable jaw can be held at any positions on the scale by means of a spring constant. Fine adjustment can be made by means of a convenient thumb operated strip which is allowed to disengage for fast adjustment. Packed in velvet case. Least Count 0.01 cm.