harpenden caliper

[Mr.Freeze]

Anybody use them? What about calibration do you need to do it often?

[warlock]

Apparently is the best precisely because it doesn't loose it's calibration easily like the other types.

$400 i don't have and I never find one on Ebay when I tried

[Mr.Freeze]

yup that about it 500$ with shipping and taxe .....