Features: measure of sulfu rubber and plastic products of instrument hardness. OOTDThe dialing scale is clear, and the scale is more intuitive and convenient. Type O is suitable for microporous materials made of foaming agent in plastic. Type D is suitable for general rigid rubber, resin, acrylic, glass, thermo-plastic rubber, printing plate, fiber, etc. Easy to use, accurate measurement, easy to carry, durable and stable. Specification: Material: Metal Size: About 80x53x2 5mm/3x2.1x1.0in Type: O/D (Optional)Package Included: 1x Hardness TesterNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.