This instrument is designed to be used for laying the German 81 mm Mortar in azimuth and elevation. It embodies means for obtaining right or left lateral deflection, elevation or depression, and a collimator sight for sighting on an aiming point.
The elevation scale is graduated from 0 to 16, representing 0 to 1600 mils. The lateral deflection scale is graduated from 0 to 64. The collimator sight consists of a reticle having horizontal and vertical translucent slits located at the focal length of a single eye lens. The grooves on the top and side of the collimator are used as an open sight.
German: p. 182 (June 1, 1945)