McMaster 6302N12 Economy Dial Plunger Variance Indicator with Flexible-Arm Magnetic-Base Holder

Measure in almost any position—these variance indicators have an adjustable ball-and-socket arm that locks in place with a lever. With a magnetic V-grooved base, they mount securely to both flat and curved metal surfaces. A spring-loaded plunger retracts and extends to measure objects. These indicators have a continuous dial numbered clockwise around the face, so it’s easy to see how much a dimension increases. Adjust the tolerance pointers to mark measurements that fall outside your limits. For quick dismounting, the base has a magnetic release switch.