range finder

American  

Or rangefinder

noun

1. 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.

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Etymology

Origin of range finder

First recorded in 1870–75

Example Sentences

Monahan also confirmed that the use of range finders will be allowed at tournaments between next month's Masters and the US PGA Championship in May to see whether this improves round times.

From BBC

When the astronauts of Crew-5 mission arrived at the space station, their Dragon capsule used laser range finders called Dragon Eyes to guide the spacecraft during docking.

From New York Times

More than a month ago, the commanders of his frontline artillery unit secured a far more advanced tool: a high-tech, Western-supplied laser range finder to help with targeting.

From New York Times

According to the Pentagon’s accounting, the equipment sent to Ukraine includes more than 50,000 sets of body armor and helmets, 2,000 optics and laser range finders, night-vision devices, thermal imagery systems and more.

From Washington Post

He began designing and selling his own accessory that allowed gun owners to add lights, a range finder and lasers onto the rifle.

From Seattle Times