Abstract: The controller divides a display of the display component provided to the main body case into a first display area that is disposed on a sensor mounting component side and displays measurement values, and a second display area that is disposed on the opposite side from the sensor mounting component side and displays input buttons. When the acceleration sensor has detected that the orientation of the main body case is inverted in a horizontal direction, the controller rotates a display of the first display area and a display of the second display area 180 degrees within each of these areas.

Abstract: The controller divides a display of the display component provided to the main body case into a first display area that is disposed on a sensor mounting component side and displays measurement values, and a second display area that is disposed on the opposite side from the sensor mounting component side and displays input buttons. When the acceleration sensor has detected that the orientation of the main body case is inverted in a horizontal direction, the controller rotates a display of the first display area and a display of the second display area 180 degrees within each of these areas.

Abstract: When a computer issues a reading request for data stored in a storage medium, it is judged whether or not the respective data for which the reading request is issued are in cache hit with data that are stored in a read buffer. Only data which are not in cache hit among the data for which the reading request is issued are read out from the storage medium, so as to be buffered in the read buffer. The data for which the reading request is issued are transferred from the read buffer to the computer, and data at addresses which are subsequent to the data for which the reading request is issued are pre-read from the storage medium and buffered in the read buffer so as to be continuous with the buffered read data. Thereby, it is possible to utilize cache data efficiently and effectively.