noun
A device for measuring distance, used in photography, surveying, or military applications. Loanword from English.
このカメラにはレンジファインダーが付いている。
This camera has a range finder.
レンジファインダーで距離を測る。
Measure the distance with a range finder.
Variant with interpunct, sometimes seen in technical contexts.
Borrowed from English 'range finder'.