This eyepiece series converts most auto levels and theodolites to autocollimation instruments. Illumination of reticule is provided by the W-K LED Illuminator, WK-31-1112. The plug-in lamp (LED) is used for circle illumination of the Wild Optical Theodolites and Wild A/C Eyepiece Illumination. Can be adapted to fi t other makes and models of theodolites, transits, and levels. Also shown with WK-31-3202 eyepiece with bayonet mount.