The Gillmore Apparatus determines initial and final set times of Portland cement. As well as masonry cement, hydraulic hydrated lime and certain mortars. The apparatus features two stainless steel needles with 3/16″ cylindrical flat-end needles. One is 1/12″ in diameter and weighs 1/4lb for the initial set. The second is 1/24″ in diameter and weighs 1lb for the final set.