Range finding apparatus and system

A range finding system includes: an electromagnetic output to provide a first beam of electromagnetic radiation along a first beam path; an electromagnetic input to receive reflected electromagnetic radiation of the first beam from an object for determining a range of the range finding system from the object; and an enclosure including a side wall that surrounds a central axis of the enclosure, the side wall transparent to the electromagnetic radiation provided by the electromagnetic output. The electromagnetic output and electromagnetic input are disposed within the enclosure such that the electromagnetic input is located outside a second beam path of a second beam of electromagnetic radiation defined by a specular reflection of the first beam on the side wall. Since the electromagnetic input is located outside the second beam path, the specular reflection of the first beam off the side wall does not reach the electromagnetic input.