I'd like to know how a weighing machine works, i open one and i saw some wire going out of one leg?, 2 metal strips to either side, 9v battery, what's about the wires going of the 2 strips?. i tried to turn on the segments one by one with the 9v battery, but i got 888, since i dont know how to turn 'em on i connected the 9v to each of the dysplay #.TIA