When do I adjust `humid´ or `dry´ measurement settings? (for Fibox 4 / trace, Microx 4 / trace, OXY-1 SMA/trace, OXY-1 ST/trace, OXY-1 WM/trace)

For measurements at humidity ≥ 50 % and for liquids you have to set `humid´; measurements below 50 %  humidity are performed in `dry´ mode.