Features: 1. A portable instrument which can perform on-site hardness test on soft metals in accordance with Chinese Standard YS/T420-2004 and American ASTM B647-84. 2. Used to check the result of heat treatment and determine if the mechanical performance of the workpiece is acceptable. 3. This hardness tester is used to quickly test the hardness of aluminum alloy profiles, tubes, plates, aluminum workpiece and other mild metals, with internal diameter more than 10mm thin aluminum tube. 4. Used for testing the with long or heavy workpieces or assemblies inconvenient to be sent to the labs. 5. Ideal for qualification inspection on the production site, for testing aluminum alloys. 6. The hardness value of wechsler can be converted into vickers hardness and brinell hardness. 7. With high-strength pointer, long - term use or wrong operation are not easy to bend deformation, and anodized handle is resistant to abrasion and pollution. Specification: Item Type: Hardness Tester Material: Aluminum Alloy Range: 0-20HW (equivalent to 20-110HRE) Indication Error: 0.5HW (5-17HW) Repeat Error: 0.5HW (5-17HW) Package List: 1 x Hardness Tester 1 x Hardness Block (High 1901-3267 15hw )( Numerically random) 1 x Hardness Block (Low 1901-3151 10hw)( Numerically random) 1 x Wrench 1 x Spare Pressure Needle 1 x Screwdriver 1 x Tool Box .