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

Mine pictured below is .076 volts ( 76 mV) with distilled water, 1 bottle of Justice Brothers Super Radiator Cooler and 1 bottle of Justice Brothers Cooling System Protector.

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