This Hampton Nautical solid Brass Theodolite 10 inch is beautifully detailed, functional, and calibrated. Theodolites are still used today for ultra high precision optical alignment and measurement. 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. Brass theodolite is primarily for nautical decoration and not manufactured for use as an actual measurement instrument Solid brass housing and body Functional compass and telescope Glass optics for clear viewing Modern design on a classic nautical instrument Dimension: 3" L x 3" W x 10" H Weight lbs= 10