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Rangefinder
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<p>A rangefinder (also rangefinding telemeter, depending on the context) is a device used to <a href="/facts/Length_measurement/rGJdrNrl">measure distances</a> to remote objects. Originally optical devices used in <a href="/facts/Surveying/qchGcnRC">surveying</a>, they soon found applications in other fields, such as photography, the military, and space travel. They were especially useful for finding the range of a target, such as in <a href="/facts/Naval_gun/g5WabhqU">naval gunnery</a> and <a href="/facts/Anti-aircraft_artillery/fHtGQpLy">anti-aircraft artillery</a>. The word <i>telemeter</i> is derived from <a href="/facts/Ancient_Greek_language/LIK7NlUh">Ancient Greek</a> <i> </i>τῆλε<i> (<i>têle</i>)</i> 'distant, far away' and <i> </i>μέτρον<i> (<i>métron</i>)</i> 'something used to measure'. </p>