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  • progway
    CZ
    2020-08-26 09:13:07

    It works, I just don't know why O3 gradually rises to 200ppm at startup, then immediately starts to fall to zero. Otherwise, PM and TVOC work as they should. Overall, I am satisfied.

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  • honch
    JP
    2020-08-16 20:59:35

    I bought for O3 measurement. (Because the O3 measuring instrument is expensive) I don't know the accuracy, but I think it works well. Even if the time is adjusted, the clock does not advance during measurement. A mysterious specification.

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  • 2020-08-04 03:34:57

    unconfirmed delivery ignore the delivery confirmation mistake

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