Hi Brian –
The meters are calibrated at the factory, but it sounds like you got a bad calibration. Typical offset is in the tens of microamps.
We’re happy to replace your meter, very sorry for the trouble. Please email at firstname.lastname@example.org to arrange it.
Also there’s a “zero” button in the app that will zero out the DC offset, but it’s only a temporary offset. Your meter should not be reading 1mA off out of the box.