Feature: 1. Hand?held hardness tester is easy to use, easy to carry, with high efficiency and good reliability. 2. Adopting mechanical regular design, compression spring detection device, tightly connected assembly, not easy to damage. 3. Independent dial with shrapnel type force transmission, intuitive and clear reading, accurate measurement. 4. Made of high quality iron, the portable hardness meter is sturdy, wear?resistant and corossion?resistant with long service life. 5. Hardness meter is widely used in the hard or semi?hard brass and super hard aluminum alloy material, which can accurately test its hardness. Specification: Item Type: Hardness Tester Model: W-20B Material: Iron Application: Metal hardness measurement Range: 0~20HW Accuracy: 0.5HW Applicable Material: Aluminum Alloy Hardness Range: 25~110HRF Sample Thickness: Approx. 0.6-8mm / 0.02- 0.31in Sample Inner Diameter:?? 6mm / 0.24in. Package List: 1 x Hardness Tester1 x Dedicated Wrench1 x Small Screwdriver2 x Hardness Block1 x Spare Indenter1 x Key1 x Manual 1 x Tool Box Note: This instrument is an accurate instrument, and its service life is mainly determined by whether the method of use is correct and whether the maintenance is timely and proper. Pay attention to the following points in use:1. Anti?fouling. The instrument should always be wiped with a soft cloth during use to remove the dust and dirt attached to the surface of the instrument, especially the supporting surface of the anvil and the pressure needle cylinder. In particular, it is necessary to prevent dirt from entering from the gap of the dial or around the pressure needle. A large amount of dirt from the above?mentioned parts will affect the measurement accuracy or cause failure.2. Anti?corrosion. Although all parts of the instrument have been rust?proofed, if they are improperly maintained or used at the production site for a long time without paying attention to maintenance, some parts may be rusted. It should be noted in use. In addition to frequent wiping, special attention should be paid to waterproofing. Many parts will rust when exposed to water, and water in the meter head will rust and cause the instrument to be scrapped.3. Anti?falling. This instrument is composed of many accurate parts. If it falls, it will cause permanent damage to some parts.