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That reads motion of the anvil in whatever resolution is selected by a switch on it -- or is just a fixed sensitivity. The principle is that you set it to a standard, and zero the scale, and then it will show you how far over or under the desired size you are. I don't know the resolution on that one -- but it is probably good enough to display an microinch of difference.
Enjoy, DoN.
P.S. My news server seems to be getting better, but I'm still losing some articles -- so if you really need to communicate with me, send me e-mail. :-)