| 摘要 |
An indoor oxygen gauge is provided to keep comfortable indoor environment by allowing users to easily check whether oxygen concentration in a room is proper. An indoor oxygen gauge(1) is manufactured in a table type and a wall surface type. An indoor oxygen state is indicated in a step graph and characters, for showing a degree such as insufficiency, propriety and excess, easy to understand. A humidity meter and a thermometer are added to the oxygen gauge to form a multi-functional indoor oxygen gauge.
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