The machine is working well, but i cant get a picoTesla reading with hotkey 2, it zeros. I have Uscale=Auto, Atten=0dBm, UNCAL is not showing. Using a 50Hz wire as a test approximately 60cm clear length in the middle of an indoor room, I can isolate the H-field plane, and I can get down to 5-10nanoTesla, then it zeros - even with the tiniest possible movements away from the wire.
At KHz ranges I can get picoTesla noise/signals. I just cant get this sensitivity at low Hz.

The 3Hz RBW (default setup with hotkey#2) simply does not offer enough sensitivity so you get no reading at all if there is only a weak magnetic field (<=1nT). Switch to 1Hz RBW for better sensitivity. This setup will even show the regular noise so you allways get a "reading".
Anyway to measure in the pT range at SLF or ELF frequency range you would need a better antenna like our new MagnoTRACKER, have a look at viewtopic.php?f=30&t=1121
With this antenna you might even measure in the fT range