Thess metal hardness testers have a large and clear display which are integrated in the robust ABS plastic housing . With background lightning, the LCD display of the metal hardness testers offers a clear overview of the recorded metal hardness values even in dimly lit work areas. The wireless printers (included as an standard accessory) offer any time printing facility of the values recorded. These metal hardness testers can measure hardness in any known metal hardness scale as also can covert readings of any scale to any scale.