Akademik

a measuring instrument (acoustic or optical or electronic) for finding the distance of an object

1. : an instrument used to determine the distance of an object and usually constructed to give a rapid mechanical solution of a triangle having the target at its apex and the range finder at one corner of its base

2. : tachymeter

3. : a camera attachment for measuring by optical means the distance between the camera and an object

any of various instruments for determining the distance from the observer to a particular object, as for sighting a gun or adjusting the focus of a camera. Also, rangefinder.

[1870-75]

range finder,

an instrument for estimating the range or distance of an object: »

This superb 35mm camera has lens-coupled range finder combined with view finder (Time).