The large color LCD touch screen installed at the middle of the freezer, makes it easy to see the temperature which is displayed in large letters. In addition, the temperature for every 24 hours is displayed as a graph on the screen. It can also be used with gloves on, and a USB port equipped on the side of the screen, makes it possible to extract 1.5 months worth of operation history, which is recorded in 2-minute intervals, as a CSV file in order to manage the operation history on a computer.