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They consist of a number of small lengths of steel of different thicknesses with measurements marked on each piece. They are flexible enough that, even if they are all on the same hinge, several can be stacked together to gauge intermediate values. It is common to have two sets for imperial units typically measured in thousandths of an inch and metric measurements. Manufactured using steel for strength. A thread gauge, also known as a screw gauge or pitch gauge, is used to measure the pitch or lead of a screw thread. A feeler gauge is a tool used to measure gap widths. Feeler gauges are mostly used in engineering to measure the clearance between two parts. Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole To use a thread gauge, the user must first match the type of thread to the gauge. For example, attempting to measure metric threads with an imperial gauge will not return accurate results. To determine the correct gauge, Once the correct gauge is determined, the user should extend one of the leaves of the tool and press it against the threaded portion of a screw. If the teeth (cut into the leaf) match the spacing of the thread, then the user can read off the thread pitch stamped into the leaf. How to gauge wire? Many people complained that the gauge was not accurate for wire,they made a mistake on how to measure wire