Hardness Calculator APP Vertex Hardness Calculator ( https://www.vertexmachines.com ) is an application which is used to calculate Hardness in Brinell, Vickers & Knoop scale, user have to select appropriate Hardness scale and enter the basic information. http://www.vertexmachines.com > Downloads > Hardness Calculator Direct link: https://www.vertexmachines.com/downlods/hardness_calculator We care about your privacy and security of your personnel information. Read more