You may consider bridges from linear research inc. in San Diego California.
They will do 10 milliohms at 2 kohms. But they are not inexpensive.....



--On Friday, May 17, 2002 12:40 PM +0900 "\"@/CfH#\"" 
wrote:

> Hi all,
>
> I'd like to get information about precision measurement system which can
> detect resistance change due to piezolever deflection ( resistance change
> :10 ~ 300 mili ohm in 2 Kohm resistance piezolevern which purchased from
> Microscopes ).   This type of small resistance change can be measured by
> wheatstone bridge type measurement system, but most of them cannot
> measure such a small resistance change in a big resistance piezolever.
>
> Please, let me know if you have or know what kinds of systems are
> commercially available and where to buy those kinds of systems.
>
> Thank you.
>
> Choongho Yu
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Bellave S. Shivaram
Department of Physics
University of Virginia
Charlottesville, VA. 22901
Tel: 804-924-6818
FAX: 804-924-4576