The refurbed CAT S61 is the flagship on every construction site, but it also has a place in the pocket of enthusiastic craftsmen, renovators and technicians. As usual with CAT, the smartphone has a rugged build and prioritises stability, durability and indestructibility over handiness or design. With a real thermal imaging camera from FLIR, you can easily detect leaks in house seals or components in electrical circuits that are too hot. A laser rangefinder makes it easier to take measurements while the air quality sensor warns you if the concentration of dust or solvents in the air is too high.