range finder
or range·find·er
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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.
Origin of range finder
First recorded in 1870–75
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for range finder
Historical Examples of range finder
Garboreggg adjusted a second control that was something like a range-finder.
Raiders of the UniversesDonald Wandrei
The range-finder and switch were on a ledge at one of the windows.
Just carried on with that sketch of Hopkins at the range-finder.
A Case in CameraOliver Onions
And first it may be stated that the range-finder is largely a measure of mere economy.
Steam Steel and ElectricityJames W. Steele
Once more came the signal into the turret from the range-finder.
Two Boys of the BattleshipFrank V. Webster