Reg Edwards wrote:

-snip-

To gain support for the validity of a measurement result by stating
the manufacturer's name and serial number of the instrument used
doesn't carry much weight since accuracy depends on the person who
made the measurement and many other just as important factors. People
can't be avoided.

-snip-

I was taught to record ID information of all the tools and instruments
used, but I always took that to mean that it was to keep track of what
things to check if anomolies cropped up.

Having said that, if someone gives me a 5-digit voltage reading taken by
a 3-1/2 digit Rat Shack meter I'll believe it much less that if the
reading is taken by a recently calibrated name-brand 5-digit meter (and
I won't believe it much at any rate -- 5-digit voltage measurements have
_lots_ of embedded voodoo).

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com