Is there a tool or a device that measures oxygen level in a certain space?

Question by goahead: Is there a tool or a device that measures oxygen level in a certain space?
I mean something small not industrial type. Something to be used at home or in the office.
If yes, where do you think I can find one? I asked a shop that sells personal safety equipment but they said there is no such devices, they have devices that measures oxygen levels in blood only but not in the air!
Thanks for Your help


Best answer:
Answer by beaverYou're god-damned right there is! I

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