Don't do this:
Do this:
That's my $6 HF caliper, but a more expensive one may work just as well :rolf:. Put the fence tight against the blade, measure over both (be sure you are over the teeth if the tips have overhang) and zero the caliper. Now move the fence slowly out to the size you need and go back and forth to both sides of the blade to make sure the fence is parallel to the blade. Doing it this way gives you a much longer surface resting against both the fence and blade as well as across the top of the fence to help you keep it level. If you want to get even a little more dead on, mark the the top of the fence using a square to get a reference line.
Do this:
That's my $6 HF caliper, but a more expensive one may work just as well :rolf:. Put the fence tight against the blade, measure over both (be sure you are over the teeth if the tips have overhang) and zero the caliper. Now move the fence slowly out to the size you need and go back and forth to both sides of the blade to make sure the fence is parallel to the blade. Doing it this way gives you a much longer surface resting against both the fence and blade as well as across the top of the fence to help you keep it level. If you want to get even a little more dead on, mark the the top of the fence using a square to get a reference line.