When HN users recommended it
3 HN users recommended this between 2019 and 2022, in 3 comments.
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.
3 HN users recommended this between 2019 and 2022, in 3 comments.
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.
Its this one: https://www.amazon.com/gp/product/B00H7HFINS/ref=oh_aui_sear...
I put a four of them around my house, each connected to a Raspberry Pi. CO2 levels were way higher than I expected.
This one I think:
https://www.amazon.com/CO2Meter-RAD-0301-Mini-Monitor-White/...
Amazon link: https://www.amazon.com/CO2Meter-RAD-0301-Mini-Monitor-White/...
Artwork slightly different, but appears to be same product: “Using NDIR CO2 Sensor Technologies; Technical Specifications: CO2 Measurement Range: 0-3,000 ppm; Response Time: < 2 Minutes; Accuracy: 0-2,000 ppm ± 100 ppm or ± 7% of reading; Sensor Life Expectancy: 15 years”.