Pencil Hardness Tester HT-6510P Applications: Pencil Hardness Tester HT-6510P applies mechanical measurement. Keep three point touch the coating (two wheel, pencil core), and a 45 degree angle between pencil and test surface. Push the instrument sliding, pencil draws the correspondingtrack in the coating. In the change of different pencil marks, the hardness value of the film can be determined. **** For more details,please do not hesitate to contact us.Thank you!