RyanN:
I'll need to look into inverted serial signals, and how to fix this in hardware. I'm going to use bluetooth between the scale and the arduino which will make my client very happy.
You can use logic inverter chips if needed but the Software serial has a poorly/un documented signal inversion flag. So you could connect the scales to software serial and pass results to hardware if needed.
// public methods
SoftwareSerial(uint8_t receivePin, uint8_t transmitPin, bool inverse_logic = false);