"Keithley SourceMeter Series 2600A combines in one instrument a power supply, true current source, 6.5-digit DMM, arbitrary waveform generator, V or I pulse generator with measurement, electronic load and trigger controller."

"The two-channel Model 2182A Nanovoltmeter is optimized for making stable, low noise voltage measurements and for characterizing low resistance materials and devices reliably and repeatably. It provides higher measurement speed and significantly better noise performance than alternative low voltage measurement  solutions..." [http://www.tek.com]