Abstract: A hole angularity gauge is disclosed which is small, durable and easily calibrated. The gauge includes a probe which is sized to fit the hole to be measured. The probe is coupled to a lever, both of which are pivotal about a first pivot point whereby the lever is angularly displaced in response to any angular displacement of the probe. The gauge further includes a linkage asembly that amplifies the angular displacement of the lever. The linkage assembly includes a pointer which is adapted to pivot about a second pivot point. The pointer is coupled to the lever at a point that is displaced from the second pivot point such that the pointer is angularly displaced in response to any angular displacement of the lever whereby the angle that the pointer is displaced is a multiple of the angle that the lever is displaced. The probe further includes apparatus for indicating the angular displacement of the probe and, accordingly, indicating the angularity of the hole.