torque wrench question

[Brian Burkhalter <Brian.Burkhalter@Eng.Sun.COM>]

I've been off the list now for quite some time as I've sort of left the project 
drop ...

Anyway, what I wondered was a couple of things about torque wrenches:

1. Calibration

Has anyone ever had their wrench calibrated? Is it preferable to buy a new one?

2. Aging

As a torque wrench ages will it tend to tighten things too much or too little?

Thanks!

Brian