Six rare earth magnets hold the ruler in place instead of a clumsy screw lock. Body slides quickly and easily along the ruler through the magnetic lock. Heavy-duty cast zinc body is milled on all five sides for superior accuracy. 12" ruler is etched with markings to 1/16" and 1mm. Features onboard spirit level and EasyGrip scribe.
Well, Obviously either these people are extremely lucky and have 100% accurate squares or they didn’t bother measure against engineering squares and digital angle gauges. This thing is so off it’s not usable at all. Super idea and magnets work great too bad it is way off by few degrees. Don’t take my word for it. If you going to buy one at store, take an engineering square or digital angle gauges with you or if you order on line make sure you test it. After all what good is a square that is not square.2 star i like the idea but that's all.
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