“Department” means Maryland Department of Agriculture. Farm Milk Tank. “Farm milk tank” means a unit for measuring milk or other fluid dairy products, whether stationary or portable. It shall be considered suitable for commercial use only when it comprises: A vessel, whether or not equipped with means for cooling its contents; Means for reading the level-of-liquid in a tank, such as a removable gauge rod, surface gauge, or a gauge tube; and A chart for converting level-of-liquid readings to gallons or avoirdupois weight on the basis of 8.6 pounds per gallon. Each compartment of a subdivided tank shall, for the purpose of these regulations, be construed to be a “farm milk tank”. “Secretary” means Secretary of Agriculture or the Secretary’s designee.