Thanks for the explanation about the inline fuse.
The zero button does not work for me. The zero button turns green, but the resistance values still show 1.85 ohms or so. Going back to the scan page, returning to the meter display, it looks like zeroing is being applied, but then I can’t turn it back off. The button toggles red and green, but the resistances don’t change. After a while, I start seeing negative resistance values, which seem to confuse the auto ranging function, as it sticks on 2.5 megaohms range.
This is a RevI PCB, firmware build 1447458797, Android app 1.0.17 (444).