Applicable to the comparison method to measure the workpiece diameter, accuracy 0.01mm. This series of internal diameter indicator with excellent guide bridge, self-centering accurate and reliable. One end of the measuring head is the movable probe, and the other end is the changeable probe which is changed according to the measured aperture. Name: Dial Bore Gauge Range: 50-160mm plastic box: random color, don't accept the specified color color: silver Material: metal Package Contents: 1 x Dial Bore Gauge 1 x Guide Bridge 6 x Accessories Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.