Disclosed herein is a calibration apparatus for vacuum gauge having a combined use for an 1 Torr level, a 10 Torr level, and a 100 Torr level vacuum gauge. In one embodiment, graphical user interface content which defines a graphical user interface is provided. A clean and core operator may then take an item of harvested produce and core it using the coring device, before placing the cored item of produce onto the elongated harvesting apparatus.