Hi Paul,

The firmware and app already try to compensate for the value of the PTC, the problem is that the value of the PTC changes with time, temperature and overload events. This is why the Mooshimeter’s specs say “resistance between 20Ω and 20MΩ”. After zeroing out the resistance readings should be accurate in the very low range, but I’m reading reports that the zeroing feature isn’t working for some users, so I’ll try to address that soon.

Best
~James