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@Tetraspace that was close.

Now - what kind of hotel is that?

@Tetraspace why is it so high

Opening windows certainly makes this more likely but do we know if there are any windows that can be opened? Do you know what floors the hotel occupies?

Was about to invest all my $ till I read the discription

You can expect the level of oxygen to be at ~21%, just like it is pretty much everywhere on this planet, with the exception of hermetically sealed volumes - which hotels are not, due to the presence of doors and windows.

1000ppm is just 0.1% of the total mix and therefore can't affect the concentration of oxygen in any meaningful way. Also, you can easily get this result with two people in a small room with closed windows because physiology.

@MaxA for the resolutionof this market we will open all available windows

@MaxA with US forced air systems that doesn't necessarily happen. Granted my bedroom isn't small but my CO2 monitor has never gone above 1000ppm in there and you can see on the chart that it's the fan coming on that brings it back down.

@AlexanderTheGreater note the "Japan" tag.

@MaxA yeah. I'm my experience large hotels in Japan also use forced air for heating.

@AlexanderTheGreater but we don't know if that's the kind of hotel Tetra is staying at. I think having windows that can be opened is the more reliable expectation there.

@MaxA I don't know what's more realistic as I don't know Tetra's hotel preferences. My only point was that in most places it's easily avoided to get to that CO2 concentration.

@AlexanderTheGreater yes, we agree on that. And seems like Tetra's sensor has too.