playing with it the scope  other day and double clicked  and held the left mouse button down on the  zero volt number on the scale and dragged it like a file and the voltage adjusted on all four channels individually

I had a hard time finding a computer?multiple tries till a Compaq evo n620 with win 7 pro loaded the drivers and id the scope?

haven't tried on car yet but looks maybe it will be ok for the money

Still playing with it

Jim