Whenever I need to set a router bit or a tablesaw blade to an exact height, I take a twist-drill bit with a diameter equal to the height I want and lay it down with the end of the shank against the blade as I adjust the height. When the top of the blade aligns with the shank of the bit, I’m there. I check the alignment by eye and then double check by running a finger across the blade to the drill shank.
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