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The Model 306L Type A Durometer is designed to measure ASTM (American Society for Testing and Materials) D2240 Type A hardness. This includes materials such as rubber, elastomers, and other rubber-like materials including neoprene, silicone, vinyl, and butyl. Soft plastics, felt, leather, and similar materials generally fall into this same range. Accurate readings can be obtained in any position. The instrument has a low glare aluminum dial with bold, easy to read numbers. The durometer comes standard with a Max Hold hand which retains the peak reading. A top knob with 8-32 threads permits both easy hand-held use and attachment to test stands.