The Titan Cathetometer is a precision optical instrument used for measuring vertical displacement in areas that are inaccessible to an indicator, scriber or other mechanical checking devices because of distance or combinations of blended curves. It is a Micro-Telescope which has a simple "Cross Hair" Reticle mounted in the eyepiece and vertical and horizontal divisions on the cross hairs combined with 2 concentric circles. It has an adjustable focal length from 4" to infinity. The Cathetometer can be attached to any standard American or Foreign Height Gauge 18" or larger by 1/4" X 1/2" holding bar, in place of an indicator or scriber attachment. Because of the light weight (1 lb.) it will level perfectly on even the lightest Height Gauge.