Feeler Gauge

A feeler gauge, also known as a thickness gauge or gap gauge, is a precision measuring tool used to measure the gap or clearance between two parallel surfaces or to determine the thickness of a narrow or confined space. Feeler gauges consist of a set of thin metal strips or blades of varying thicknesses, each clearly marked with its measurement in units such as millimeters or inches. These blades can be individually selected and inserted into the gap to determine its width or thickness.