The Devel Attrition Tester (also commonly spelled as Deval Attrition Tester) is a laboratory testing apparatus used in civil engineering and materials science to evaluate the abrasion resistance and durability of coarse aggregates, such as stones or gravel used in road construction. It simulates the wear that aggregates experience under traffic loads by subjecting them to mechanical grinding in a rotating cylinder. This test helps determine the aggregate’s suitability for applications like pavements, where resistance to breakdown is crucial.