Feature:1. With handheld design, easy to use, easy to carry, put the sample in and use it, with high efficiency and good reliability.2. With mechanical regular design, compression spring detection device, tightly connected assembly, not easy to damage and has long service life.3. With independent dial, builtin shrapnel type force transmission, intuitive and clear readings, accurate measurement.4. Hardness Tester is a portable instrument which can measure conveniently the aluminum alloy, especially can measure special workpiece shapes which can not be or inconvenient to be measured by other instrument.5. Used to ascertain whether the workpiece is processed by improper alloys, judge whether the workpiece alloy composition is qualified.Specification:Item Type: Hardness TesterModel: W-20Material: IronApplication: Metal hardness measurementRange: 0~20HWAccuracy: 0.5HWApplicable Material: Aluminium alloyHardness Range: 25~110HRESpecimen Thickness: Approx. 0.6-6mm / 0.02-0.24inSpecimen Inner Diameter: Approx. 10mm / 0.4in.Package List:1 x Hardness Tester2 x Hardness Block1 x Spare Indenter1 x Wrench1 x Screwdriver2 x Key1 x Manual1 x Carrying CaseNote:1. Prevent contamination. This instrument should often be cleaned with the soft cloth to remove the dust and dirt on the surface of it, especially on the anvil and supporting surface of the cylinder. Specially prevent the dirty things to get in from the dial seams or indenters, otherwise, the filthy things from those parts might influence on the testing accuracy or cause malfunction.2. Prevent rust. Although all the parts of instrument have been treated to prevent rust, the improper maintenance or long time of use on the production spot without paying attention to maintenance may also cause the rust to some components. When using it, pay special attention to its waterproof performance except clean it frequently, because many parts will bear rust with water, the water in the dial may cause deadly rust to make the instrument useless.3. Prevent falling off. This instrument is made up of many accuracy components, falling off of it will result in the permanent damage to some parts.