Mechanism: Consists of Carbide tipped plough, dial indicator. Misc Spec.: Employees scratch type test to check bonding and hardness of cores. Sand Type: Resin coated sand, Hot box sand, Cold box sand, No-bake Sand, Oil Sand, CO2 Sand Test:Reads hardness of Cores of most of the types. Application: To find out the hardness of baked or dried cores made out of core sands, resin sands etc.