Starrett 1015A-4 Inch Reading Portable Dial Indicator 1015A-431J Thickness Gauge Without Case, 0.0005" Graduation, 1/2" Range, 0-50 Dial Reading

After inserting work between the measuring contacts, releasing the lever will cause the spindle to contact the work, giving an accurate size reading because measuring pressure is independent of the user. Indicators have jewel bearings and continuous dials. Throat depths include 2-1/2", 4", and 6". The contact edges are radiused to prevent the work from being marred or deflected. The flat contact area measures 1/4" in diameter and is 1/8" thick.