Type A It is generally used to measure common rubber products, multi-resin, leather, wax products, etc.
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Type O It is usually used to measure low-hardness materials, such as foam, sponge rubber, plastic and microporous materials made of foaming agents.
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Type D Usually used to measure hard resin, acrylic, plexiglass, thermoplastic, printing plate, fiber and other high hardness materials.
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