Telemetra • The Rangefinder

Telemetra measures the distance to almost anything you can see. A wall across the room. A building down the street. The far side of a valley. Point your iPhone and tap. Step a couple of feet to the side, keeping the target in frame. The distance appears, with a ± beside it that tells you how much to trust the reading. Keep moving and it gets surer. No laser. No LiDAR. No reflective target. The camera watches the spot you tapped while the phone tracks its own motion through space, and the two t