- Refurbished used Toughbook CF-31 is Panasonic's reliable laptop offering the highest performance in its class along with the world’s most rugged design. With drop-shock protection and a MIL-STD-810G certification, it’s the undisputed leader in the fully-rugged category. Its new Intel® Core™ i5 and i3 processors, along with available discrete graphics, pack a punch to deliver desktop-class performance and improved video/3D graphics. Combine six generations of delivering rugged performance, and you have a computer that will go the distance with you anytime, anywhere. Customize your processor, hard drive, memory and display.