5qt Benchtop Heavy-Duty Laboratory Mixer has the same specifications as the GAM-1480, but has been factory modified with the included GAM-1481 Bracket to meet the requirements of ASTM C305, C227 and C109 (AASHTO T162 and T106) and certain other tests for mortar and cement. : AASHTO T 162 , ASTM C109 , ASTM C227 , ASTM C305 , AASHTO 106M/T 106