Grey sludge in brand new radiator - what does it mean.

uhhhhh......not from the math I learned it doesn't. Your meter shows 76.8. That's a big difference from .076.

Yes it shows 76.8 mV which is .076 Volts. It's just on the mV scale.

I just wanted the way the voltage scales Volts (mV) were stated to be in paralell from paragraph to paragraph.