Thread measuring gauges are used as a reference tool to determine the pitch of a thread on a screw or a hole. These gauges are made of plastic and feature calibrated holes & molded thread profiles to accurately identify the wire gauge, thread style and length of the threaded fasteners. They are available in both Metric and Imperial measurement standards.
Raptor Supplies also offers thread identifiers from Innovative Components for distinguishing similar inch and Metric threads. These identifiers consist of gliding gauges which can be conveniently assembled onto a wire lanyard.