Brass Theodolite 10" The azimuth and elevation axes can be read on a vernier scale with the aid of built-in magnifiers. Both axes have slow motion controls and the telescope can plunge and reverse to reduce bearing errors. With a magnetic compass mounted on top, the azimuth axis has a second spirit level mounted on the telescope with a mirror to assist in leveling while the telescope utilizes precision optics and has a brass lens cover. The theodolite s 22-power non-inverting telescope has two focusing adjustments one for the precision reticule focus and another for focusing the target. Overall Dims: 3" L x 3" W x 10" H View photos for further details.