An electronic apparatus includes first and second display devices having first and second display screens held in first and second housings, respectively. In S1, a temperature measurement is performed with each temperature sensor, and measured signals are digitalized to obtain a temperature value. The exemplary instruments, methods and systems generally include capturing a surface topography of a defect region, creating a defect region cavity, and harvesting a donor plug configured and dimensioned to be implanted in the defect region cavity. \u201cTapping\u201d or partially depressing an actuator may cause an output that is representative of its functionality to be generated on its corresponding controller display, while fully depressing an actuator may initiate execution of its assigned function.