Table Saw Alignment Jig

Here's a quick and accurate method to align your table saw blade and jointer fence to 90 degrees. You could use a square measurement but this woodworker recommends using a home made jig and a dial indicator piece as in this video.  

The jig is just two pieces of wood glued together for good height, two screws to brace the jig and a dial indicator on top. If the indicator reads zero, your table saw is aligned correctly but if it is off (above zero), this method will be more accurate than eyeballing it.