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

Other items stolen included around $200,000 in cash, gold and silver coins worth over $60,000, a Rolex watch, range finders, thermal and night vision scopes, spotting scopes and crossbows.

From Washington Times

The researchers added a range finder and a Wi-Fi sensor so the robot can avoid obstructions.

From Seattle Times

It will be the first time such devices, known commonly as range finders, will be allowed in competition at events sanctioned by major tours.

From Seattle Times

The illumination, that could have been from a laser range finder or other targeting gear, took place in an area around 380 miles west of Guam.

From Washington Times

A: Different-colored flags and pin sheets seem to be on the way out, as many courses assume golfers use range finders or GPS.

From Golf Digest