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, 4" Base with Extensions and Case.
This item is no longer available.
The direct replacement is 644JZ.
For additional support, please contact our customer service department at (978) 249-3551.
[Discontinued 10/2025]