>I am looking for an instrument to accurately measure a resistance
>of 100uOhms. This instrument will be used in a setup to trim large
>current shunts from 100uOhms -5% to 100 uOhms - 0.25%. Budget
>is < 2k USD. I have seen several options (Agilent, Keithley), but
>most are too expensive or too versatile (I only need to measure low
>Ohmic values).

Quite frankly I would just get a keithley 2400 Sourcemeter or 2700 DVM, both 
of which will do 4 lead Kelvin type measurements (which you are going to 
need at that low resistance). The cost would be within your budget I think, 
and although they have capabilities way beyond what you need, I think you 
will find this will be the case for any ready built instrument capable of 
doing what you want.

Also they both have IEE-488 ports so you could arrange an automation system 
to trim the DUT if desired.

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