Use this kit for "scratch testing" substances to determine their hardness according to the Mohs' Hardness scale, ranging from 1 to 10, where Diamond is the hardest at 10 and Talc is the softest at 1. There are many examples of where industry professionals use this tool - on concrete, faucet finishes, touch screens, countertop materials, flooring products, etc. --- What is included in the Mohs' Hardness Test Kit - Industrial version? * Four double-ended picks with eight points comprising , 3, 4, 5, 6, 7, 8 & on Mohs' hardness scale. * Two Hardness Plates (of Mohs' hardness of 3.5 and 5.5) * A 100 grit Grinding Stone to keep the points sharp. * Rugged and compact molded Plastic Case. * Hardness Table for 80 common Materials. * Complete Instructions, customized for Industrial applications.