Power brick mini - is it works?

Could somone help me setup current mesurement. Voltage mesurement works perfect but current won’t work .
For 3 Amp readings divider is around 120, for 5 Amp is 75 for 10 Amp is 60. how to set it up ? (must change divider for proper mesurement)
I know mauch products but on plane I want use this thing because 30A is enough.
Is it even work at all ? ( I checked 3 of them - same bahavior)