The ASKER Durometer Type JA for general rubber, conforming to the specifications of the former JIS K 6301.It complied with Spring type hardness tester Type A in the formerly applicable standards of JIS J6301"Physical Testing Methods for Vulcanized Rubber", abolished in Aug, 1998. However, it is used even now for measurement data or internal management data upon the agreement of concerned parties due to its extensive use historically within the rubber industry.