The present invention provides a method for customizing customer identifier. The second surface is provided with a tape fastener attached thereto. When used in conjunction with a pocketable note holder, the grip also performs additional functions: it provides an axial stop for the instrument such that it can be repeatedly placed in the same position within the holder ; and it allows the user to easily insert and remove the instrument from the receptacle, whereas this action might otherwise be awkward with a traditional small elongate object. It is suitable for storing articles in a vacuum state with limited space and preventing the articles from mildewing. A thermally conductive element conducts heat from the valve assembly away from the sensor assembly, thereby reducing uncontrolled contributions of heat to the sensor assembly. The time keeping apparatus has a time display unit for displaying time, a calendar display unit for displaying a present date, a control unit for stopping, in the power-saving mode, both time display by the time display unit and calendar display by the calendar display unit, and a time information storage unit for storing information relating to an elapsed time of the power-saving mode.