Here are instructions on how to read micrometers:
[url=http://www.mitutoyo.com/catalog/pdf/L-03.pdf:720b4]http://www.mitutoyo.com/catalog/pdf/L-03.pdf[/url:720b4]

I wouldn't spend more than $20 unless you want a good set then I'd recommend Mitutoya. You might also look at calipers (dial or digital) if you're trying to measure leaders since they're easier to hold and measure with one hand.

[This message has been edited by Austinite (edited 23 February 2006).]