A rangefinder is an instrument, usually part of a camera or a piece of military equipment, that measures the distance between things that are far away from each other.
rangefinder in British English
(ˈreɪndʒˌfaɪndə)
noun
1.
an instrument for determining the distance of an object from the observer, esp in order to sight a gun or focus a camera
2. another word for tacheometer
Examples of 'rangefinder' in a sentence
rangefinder
`The rangefinder measures them at six hundred metres now, bayim.