Feature: 1. Small size design, it is lightweight and portable, and can be easily handheld to use in various situations. 2. Simple operation, you only need to operate according to the manual, with high efficiency and good reliability. 3. Mechanical regular design, it is equipped with compression spring detection device, which can be closely connected and assembled 4. High‑quality iron material, it is durable and sturdy, not easy to damage, and can greatly extend the service life. 5. Independent dial, it has built‑in shrapnel type force transmission, the reading is intuitive and clear, and the measurement is accurate. Specification: Item Type: Hardness Tester Model: W-20A Material: Iron Purpose: It is suitable for metal hardness measurement. Range: 0~20HW Accuracy: 0.5HW Applicable Material: Aluminum Alloy Hardness Range: 25-110HRE Weight: Approx. 1470g / 51.9oz Sample Thickness: Approx.0.6mm-13mm / 0in-0.5in Sample Inner Diameter:> Approx.10mm / 0.4in. Package List: 1 x Hardness Tester2 x Hardness Block1 x Drill Seat Cover1 x Spare Indenter1 x Dedicated Wrench1 x Screwdriver2 x Key1 x Toolbox1 x Manual Note: This instrument is a 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 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 treated with anti‑corrosion, if they are used in the production site for a long time under improper maintenance or careless maintenance conditions, some parts may be rusted. Pay attention to this point during 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‑drop: This instrument is composed of many accurate parts. If it falls, it will cause permanent damage to some parts.