A hand covering including a hand receiving portion that is closed at a first end and that defines an opening at a second end. A second plate-like base substrate is connected to the primary surface of the first plate-like base substrate, and the second plate-like base substrate has a substantially same extrapolated outer shape in a plane parallel to the primary surface of the first plate-like base substrate. In use, the surface having the depressions is disposed adjacent a surface of the wound. The balance mechanism utilizes a means for holding a sample within the chamber such that the mass of the sample can be determined as it equilibrates to the temperature and relative humidity maintained within the internal cavity. Consequently, reduction in the mass flow rate of the discharge gas of the compressor can be suppressed, and it is possible to cool both the discharge gas and the motor portion by the single cooling chamber.