Many kinds of hardware have a display of some kind. Microwave ovens, home entertainment, lab equipment, printers, oscilloscope, circuit testers, etc. Even the

Many kinds of hardware have a display of some kind. Microwave ovens, home entertainment, lab equipment, printers, oscilloscope, circuit testers, etc. Even the ones that don't have a display may have printing on them, from part numbers and serial numbers to instructions and warnings.