got 15mm knuckles & want them to be 16mm?

[ClodMaxx]

yeah, i've seen the cheapie ($7) digital calipers floating all over ebay but questioned how good they are. i'll check harbor freight to see if they're the same thing - if not, i'll get one from harbor freight. thanks!

[Gustav]

They should be repeatable,if not accurate,which is all you need often,ie if your measuring everything with the same ones and they're repeatable then no problem.