The PCE-DD A digital durometer is an ergonomic device for checking Shore hardness in gum, plastic and other non-metallic materials. It is of highest quality. The PCE-DD A digital durometer is mainly used for soft gums, elastomers, natural rubber, neoprenes, casting resin, white PVC, leather, etc. If the material thickness is not enough, it should be tightened on the back with the same material in order to increase its thickness.