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This technique is known as International Rubber Hardness Degrees or IRHD. The scale for IRHD equipment corresponds to Shore A. What differentiates the techniques is that the IRHD equipment is always mounted on a stand, the loading is performed with a deadweight, the measuring probe is ball-shaped, and the reading is taken after 30 seconds. Digital automatic hardness meter with exchangeable measuring probes for Shore A, D, AM IRHD-N and IRHD-M. (Photo: Bareiss) Pusey & Jones hardness meters are generally used to measure the hardness of