Starrett 579E-8 Self Centering Telescoping Gauge - 2 Telescoping Arms, 2-1/8" to 3-1/2" Measuring Range, 8" Handle - Precision Measurement Tool for Machining, Woodworking & Metalworking Projects
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Description
Telescoping gauge is used for determining the true size of holes, slots, and recesses up to 6". The ends of both contact is hardened and ground to a radius to allow proper clearance on the smallest hole the gauge will enter. This tool must be slightly "rocked" in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. The final hole size is obtained by measuring over the gauge contact with a micrometer.
Features
It has a slightly greater range and two telescoping contacts in comparison with no. 229 series
Handle is rigidly attached to the contact plunger and is automatically self-centering
Constant spring tension gives uniform contact pressure
Both plungers are easily locked at any desired setting
