The Analog Complete O-Ring Hardness Kit is the most convenient and accurate way to perform repeatable hardness (durometer) testing on thin materials as thin as 0.050. The OTK-AN is comprised of the following items: Model RX-1600-M - Type M Analog Durometer with Certification ORF-1 O-Ring Fixture Kit (1/16, 3/32, 1/8, 3/16, 1/4) Model OS-3 Air Dampened Operating Stand TBK - Test Block Kit with Certification |