This part of ISO 7619 specifies a method for determining the indentation hardness (Shore hardness) of vulcanized or thermoplastic rubber using durometers with the following scales: - the A scale for rubbers in the normal-hardness range; - the D scale for rubbers in the high-hardness range; - the AO scale for rubbers in the low-hardness range and for cellular rubbers; - the AM scale for thin rubber test pieces in the normal-hardness range.