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Thanks for the answers.

I will be measuring in the range of 100mV to 130mV.

It seems I need to buy at least a 7.5-digit multimeter to verify the accuracy of my measurements.

What do you think about the 7.5-digit Keithley 2001 and 7510? It seems like the Keithley 7510 is better than the 2001 but much cheaper. Why is that?

Should I consider the 8.5-digit Keithley 2002 or the Keysight 3458A instead?