I work a lot with Mitutoyo and every time I close it to make sure it's zeroed it always goes past 0.0005-0.0020 and I have to set to zero every time. With the charge, I haven't had to set it to zero in the last few projects. I also like the auto-off feature, as I walk into the store with my $140 Mitutoyo and find that it's been on all night.