Do the Brite Tanks have volume markings, and what are the ranges?

The Brite Tank has an exterior sight glass

Furthermore, it features electrically etched markings on the exterior of the vessel that allows the user to monitor the amount of beer remaining.

The range of the sight glass for the 10 Gallon Brite Tank will be between 3 and 8 gallons. 

The range of the sight glass for the 1 Bbl will be between 8 and 32 gallons.