When HN users recommended it
1 HN user recommended this in 2019, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2019, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
The 'Netatmo' home weather stations record CO2 level. Mine shares over wifi. I get around 400ppm with windows open for a while, or 1200ppm with windows closed.
I don't know what the calibration mechanism is, nor the specificity.
It's around $100 on Amazon - https://www.amazon.com/Netatmo-Weather-Station-for-Smartphon...