Today is a good day to buy a carbon dioxide measurement device. Several at Amazon are under $40. #COVID
@Bertrecords Ooooh, which ones!?
@trendless There are several. Here is one. https://a.co/d/90aei7A Her is another. https://a.co/d/dgCmuEU
QOTO: Question Others to Teach Ourselves An inclusive, Academic Freedom, instance All cultures welcome. Hate speech and harassment strictly forbidden.
@Bertrecords Ooooh, which ones!?