range finder

or rangefinder

noun

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.

First recorded in 1870–75

But Fiske's range-finder makes no mathematical calculations, nor requires them to be made, and is automatic.

One of these failed to explode, but smashed the main range finder and killed one man.

The Germans have led the way in inventions for this purpose, and their Goertz range finder is perhaps the best in the world.

As the German opened fire an exclamation of surprise broke from the lips of the officer in charge of the Sydney's range-finder.

Four days ago a machine-gunner came down to us with a range-finder and supplied me with exact ranges.

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