Actually, a germanium (and likely even schottky) diode probe can work down below 100mv if the current is kept low enough (if the voltmeter is at least a megaohm or so). ?That curve is exponential, not two straight lines meeting at a "knee" as we (and LTSPICE) usually think of it. ?Below 100mv the results can be repeatable though certainly not linear. ?If we use an analog input to the Nano as the voltmeter, then everybody will have about the same voltmeter input impedance to better compare results.
> The diode probes work only above 1v levels.
