The heavy Rammax tandem roller line equipped with the Ammann Compaction Expert (ACE) is used for asphalt and base layer compaction applications. ACE measures the actual absolute compaction of the material and indicates this value in real-time to the roller operator. The measuring system is the base for the regulation and control of the vibration settings of the unit. Operating weights range from 15,650 to 20,950 pounds. Drum widths range from 55 to 63 inches.