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 inst ent. 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. The type O is suitable the micro-porous materials made of foaming agent in the plastic. Type D is suitable general hard rubber, resin, acrylic, glass, thermoplastic rubber, printing plate, fiber etc. Type A is suitable general rubber, synthetic rubber, soft rubber, poly fat, leather, wax etc. 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. Dial value: 0-100 degrees Pressure needle trip: 0-2.5 mm Accuracy: 0.1 mm Test force: 0.5 N Type: O/D/A A/O type: 0.55 N - 8.06 N, D type: 0-44.5 N Colour:Silver+black Material:metal Size:78 x 52 x 22 mm/3.07x2.05x0.87inch Weight: 200 g Package Contents: 1 x Durometer Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.