If no lung disease diagnosed, not of any use having at home. Even if you have covid, until no symptoms seen not really going to help.
Otherwise most reputable companies are good. Check if they have a guarantee.
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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