Checkpoint packs a hell of a lot of measuring into their EV600 Square — it’s a combination square, torpedo level, and laser level, plus a bunch of well-thought-out features, all in one small package.
Checkpoint CNC-machines the EV600 Square from aluminum alloy 6061, laser-engraves all the markings, and anodizes it in four different colors: Brilliant Red, Royal Blue, Black, and Platinum. They use acrylic vials with 45 minutes of angle sensitivity and a 650nm Class III laser diode that’s aligned to within a 1/4″ at 100 feet.
The rule stows inside the level and can be configured as an offset or flush square at a fixed 45°, a fixed 90°, or an adjustable angle. A threaded aperture adapts all Checkpoint lenses and accessory attachments to the tool, plus the unit has a standard 1/4″ thread for use with standard camera tripods.
The EV600 Square runs for 10-20 hours continuously on two AAA batteries, and the laser diode will last an average of 10,000 hours.
Although the EV600 Square retails for $60 you can find it for $40 at Rockler.