A radius gauge, also known as a fillet gauge, is a tool used to measure the radius of an object.
Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction.
A good set of gauges will offer both convex and concave sections, and allow for their application in awkward locations.
Every leaf has a different radius. The material of the leaves is stainless steel. It is of two types: 1. Internal 2. External. It is used to check the radius of inner and outer surfaces.