We intended to know the resistance variation of the object under the application of the pressure by 4-wire resistance measurement. The object itself has 2-10 milliohm. Under the application of the pressure, it is expected to vary and we need to know its difference accuracy within 0.4 milliohm. In other words, we need the digital multimeter which can differentiate the resistance change within 0.4 milliohm or so. We have Keithley 2000, Keithley 2400 and Keithley 2182. Does one of them work for this purpose? Do you have any suggestion? Thanks,
