Top Reading Dial Depth Gage, 0-8.6" Range, 0-100 Dial, .001" Graduations. The Starrett 642 Top Reading Dial Depth Gage uses the back-plunger indicator to provide an upward-facing dial for easier readout. The operator selects the extension and contact point required, zeros the tool on a master and then reads any deviation of the work directly on the dial. .001" Grad, 2 1/2" Base with Extensions and Case.
Indicator does not have to be repositioned to get the full range available. 2-1/2" (60mm) base. Two contacts and five extensions extend the range to 8.6" or 215mm. Charts are supplied showing combinations of contacts and extensions required to achieve certain lengths. Case is included.