I posted the question on TGP but didn't get much info, so I thought I would ask here. I'm about to try doing my own fretwork again. My previous attempt at a refret was passable and playable but not professional. I want to try again and this time I'm wanting to do top quality work. The right tools for the job weren't available to me last time, and that's why my results suffered. This time I want to do it right. Money is still tight though, and I don't want to needlessly spend money on luxury tools. So on to my question...

How flat does a leveling beam for guitar fretwork need to be? Stewmac doesn't post specs on their leveling beams, so I have no idea how true theirs are. I have found a Bostitch 16" precision beam level at Lowes for $25. It is accurate to .0005" over 1". In the worst case scenario, it could be out as much as .008" over it's length. Is that acceptable, or should I keep looking/saving for something else?

Thanks,
D