A rangefinder, also known as a rangefinding telemeter, is a tool used to calculate the distances between distant objects. Originally optical tools for surveying, they quickly found usage in other industries like photography and the military. They were particularly helpful for determining a target's range in naval gunnery and anti-aircraft artillery, for example;

The Greek words "telemeter" (têle, meaning "distant, far away") and "métron," meaning "something used to measure," are the roots of the word.

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