Hardness testing of products during mass production, generally a standard set can meet the testing requirements.

For hardness testing of heat treatment such as annealing, tempering, and quenching, if there is a hardened layer, you need to pay attention to the thickness of the hardened layer when selecting the model. If the hardened layer is too thin, you need to choose a C-type impact device.

When testing the hardness of a bearing, you need to pay attention to its diameter. If the diameter is too small, you need to choose a special-shaped support ring.

When testing the gear hardness, if the gear is too small, you need to select the DL impact device.

When testing castings, if the surface finish is difficult to process, it is necessary to select a G-type impact device.