I have never purchased a dishing tool.
What I do is to place three small same size water glasses on my granite countertop and place the rim on them with the glasses evenly spaced.
Then I measure the distance from the end of the hub to the countertop.
Then flip the wheel over and check the spacing. If it is not even I know I need to dish the wheel more.
If I was doing a lot of wheel building (I don’t) then I could see investing in the tool.
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