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Comment by nikisweeting | Hacker News Reader

This is the best one I've seen: https://boseansafety.com/products/air-quality-monitor-home-t...

It's by an industrial mining supply company instead of a consumer goods company, and seems to be more accurate than the cheap Amazon options I tried.

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This seems to look very similar to generic ali express sensors:

ie. Quick search:

https://www.aliexpress.com/item/1005005944910617.html

Generally things without user manuals, or proper specifications are either directly from there, or rebadged from there.

Ali express has the Bosean, and the specs appear to be different from the link you found. https://www.aliexpress.us/item/3256803168407076.html

I see multiple knock-offs of the version you linked, the packaging looks different than the Bosean. Is the lack of a brand or company name printed on the device a potential clue about which one’s a knock-off?

It seems unlikely it has a true CO2 sensor for that price point (it could, but the bom price of just the module is over $20). The co2 "equivalent" from VOC sensors is pretty crappy in my experience.

while true that actual CO2 sensors are expensive, this device doesn't even claim to have one

Scroll down, and it shows a CO2 measurement on the screen.

Invalid SSL cert, ironic for that domain name!

edit) nevermind, on public wifi

Works for me on iOS Safari, maybe something on your end?

No issues here with the certificate (Firefox / Windows).

It uses a certificate issued by Let's Encrypt, so you might need to update your root certificates list.

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