Features Type A is suitable for general rubber, synthetic rubber, soft rubber, poly fat, leather, wax etc. The type O is suitable for the micro-porous materials made of foaming agent in the plastic. Type D is suitable for general hard rubber, resin, acrylic, glass, thermoplastic rubber, printing plate, fiber etc. Easy to use, accurate measurement, easy to carry, durable and stable, practical and strong. The durometer is made of alloy material,waterproof not rust,fine workmanship,durable. Features: Easy to use, accurate measurement, easy to carry, durable and stable, practical and strong. This rubber hardness tester is a measure of sulfur rubber and plastic products of hardness of the instrument. Made of alloy material,waterproof not rust,fine workmanship,durable. The dial scale is clear and the degree is more intuitive and convenient. The connecting device is more convenient to use with the frame. Type A is suitable for general rubber, synthetic rubber, soft rubber, poly fat, leather, wax etc. The type O is suitable for the micro-porous materials made of foaming agent in the plastic. Type D is suitable for general hard rubber, resin, acrylic, glass, thermoplastic rubber, printing plate, fiber etc. Specifications: Type(Optional): A, O, D Dial value: 0-100 degrees Pressure needle trip: 0-2.5 mm Pressure needle end pressure: A/O type: 0.55 N - 8.06 N, D-type: 0-44.5 N Accuracy: 0.1 mm Test force: 0.5 N Size: 78 * 52 * 22 mm/3.07*2.05*0.87inch Weight: 200 g Instructions: The sample on strong plane, take the hardness tester, pressure needle distance sample at least 12 mm edge smooth put pressure on foot pressure in the sample, makes the needle vertical pressure into the sample, until the feet and sample completely contact pressure when within 1 s reading. Measuring at least 6 mm apart in different positions of the measurement hardness value 5 times, take the average (micro porous materials are measuring at least 15 mm). In order to stabilize determination conditions, to enhance determination accuracy, hardness tester device should be in the same determination on supporting producer determination. Package Included: 1 x Rubber Tire Durometer Package List 1 x Rubber Tire Durometer