Had a contractor come in to take measurements for our basement rebuild. 3 main rooms, two closet rooms and a bathroom. He had a Bosch GLM165-40 “Blaze Pro”. Furthest distance measured was about 40ft. For fun, I measured his laser against a tape and was surprised how accurate it was. He used a “target card” for the longest distance. In a 10ft area, I set the target card up at one end, and measured with the tape. The laser read exactly the same distance as best I could tell.