A method of installing a door glass on a vehicle door. The frequency having the high resolution with only the reference clock frequency without heightening the frequency of the reference clock signal is detected, to thereby enhance the quality of data. At the same time, trial writing that corresponds to the difference in the jitter of the 2Tw mark and a mark of 3Tw or more is enabled by providing multiple error pulse thresholds. The Schottky electrode forms a Schottky junction on the gallium nitride region. At least a portion of the indicating device is fixedly connected to the container and is reversibly removable with the container from the dispenser housing.