W Series Webster Hardness Testers W Series Webster Tester is a portable instrument which can on-site test soft metals quickly. The Webster Hardness Tester is used to inspect the result of heat treatment, to sort the materials in the warehouse, and to test the long workpieces inconvenient taken to the lab. The Webster hardness tester is very suitable for quality inspection of batch products one by one in the production field. The hardness value can be read directly on the indicator dial. W-20 Webster Hardness Tester by Tianxing is the choice of virtually every aluminum extrusion manufacturer in China. This first hardness tester specially crafted for aluminum have improved the As the first hardness tester specially crafted for the aluminum industry . A test can be completed by one press. Model W-20 equivalent to Model B Tester Models for testing brass, copper and mild steel respectively Modification models for testing thick pieces or slim tubings Tests sheets, extrusions, pipes Very fast, very simple and very portable Small indentation Conforms to ASTM B647 Recommended in YS/T420.