Lasers are some of the coolest devices around. We can use them to cut things, create laser light shows, and also as a rangefinder.[Ignas] wrote in to tell us about [Berryjam’s] AMAZING write-up ...

Only here, it’s a laser rangefinder. In this project (automatic ... of the reflected spot through a lens on a linear image sensor (which renders as “photodetector line” in translated Russian).