An optical probe includes a probe cover, within which is installed an optical system having an illuminating optical system and a receiving optical system. The portable surgical tray unit can also include a plurality of instruments connected to the portable surgical tray and operably coupled to the processing unit, and a user input device positioned on at least one of the instruments. Other methods, apparatuses, and systems also are disclosed. Each processing unit R1-Rn executes display processing for the display area for which use is allowed. The present invention relates to a three-piece solid golf ball comprising a core composed of a center and an intermediate layer formed on the center, and a cover formed on the core, wherein. The inlet is fluidly connected to the valve to receive high-pressure refrigerant and the outlet is fluidly connected to the evaporator to deliver low-pressure refrigerant thereto.