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Both analog and digital meters are available. The measuring accuracy is clearly enhanced when the meter is stand mounted, as the meter is parallel with the testpiece and the correct load is used. If a timer is used, the precision is additionally improved. Comparison between IRHD, Shore A and Shore D. The IRHD technique was created within ISO so as to improve the accuracy in measuring hardness. 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 larger rubber covered rolls, since the device can be used on curved surfaces.
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