To provide the most effective method for the measurement of a degree of vacuum and a temperature in a container having a vacuum atmosphere or a gas atmosphere.
A vacuum gauge stores a thermometer and a vacuum gauge in a single case. Fig.3 shows one example thereof. The uppermost display unit uses a large size, and a degree of vacuum and a temperature at a time point are alternately displayed. A compact display unit is present at a lower part, and when a first stage and a second stage reach specific temperature set values, in addition, when a third stage and a fourth stage reach specific degrees of vacuum, the vacuum gauge has a function for transmitting signals to the outside. A combination or the like of the temperature and the degree of vacuum by the setting of the compact display unit on them has various use methods.
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