a measuring instrument (acoustic or optical or electronic) for finding the distance of an object
例句
用作名词 (n.)
Moe has a grass shearer in his mouth and ultrasonic range finders to keep him from crashing into things. 莫伊的嘴巴里安装有割草机，身上还装有防止碰撞物体的超声波测距仪。
In fact, Swarovski is the only one who could produce full range of optical products like binoculars, telescopes, rifle scopes, night vision devices and laser guides. 施华洛世奇是世上唯一能够生产全系列双筒望远镜，单筒望远镜，枪械瞄准镜，夜视仪及镭射测距仪的公司。
美
