Yesterday I mentioned Grizzly’s SuperBar, but if you really want to be accurate when adjusting your saw blade, you’ll want to use that gauge in conjunction with a Master Plate. You install Grizzly’s Master Plate on your saw’s 5/8″ or 1″ arbor — unlike a blade, the Master Plate won’t flex when you’re making your measurements. It’s worth the extra effort to keep the blade at exactly the correct angle to the work surface, ’cause if you’re off just a degree, or a fraction of a degree, it’ll show up as loose joints in the end product.
Grizzly’s Master Plate measures 6″ by 10″ with zero runout, and it’ll help you set your saw to 90 degrees or any other angle. It sells for about $50.