range-finder

n device for finding the distance of sb/sth to be shot at or photographed （射击或摄影用的）测距仪, 测远计.

rancher, rancid, rancidness, rancor, rancorous, rancorously, rancour (US rancor), rand, randily, randiness, random, random access (also direct access), random signal, randomize, randomly, randomness, randy, ranee (also rani), rang, range, ranger, rani, rank, ranking officer, rankle, rankly, rankness, ransack, ransom, rant, ranter, rap, rapacious, rapaciously, rapacity, rape, rapid, rapid transit, rapid-fire, rapidity,