Reply by PurpLev

+1 for keeping blade+miter+fence in alignment. what more it is easier to keep everything aligned the same way then having to remeasure blade-fence and blade-miter slot (you have 2 miter slots by the way). also if you use a sled you’d want the blade to be parallel to the miter slot or you’ll run into trouble.

that said – like other have said, I simply use a standard combination square to align my TS and I have had no issues with it (FWIW I have a dial indicator, and after aligning my TS with a square I checked with the DI and found out that the TS was aligned well enough to call for any expensive alignment tools)

-- ㊍ When in doubt - There is no doubt - Go the safer route.