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Among these, the most common are indicated in the ISO standard. Shore A is used for regular rubber hardness, Shore D for hard rubber and Shore AO for soft rubber. Shore AM is a Shore A micro technique for thin test pieces. All measuring scales have the end positions 0 and 100, where 0 is infinitely soft and 100 infinitely hard. The difference between the scales comprises of different probes and spring forces (see Table). The Shore meters can be used either as stand mounted or as handheld meters. 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.
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