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We maintain popular open source air quality monitor projects. You can source the components yourself or get a kit from us [1].

The indoor kits include a high quality NDIR CO2 Sensor from senseair.

[1] https://www.airgradient.com/kits/

I use an Awair Element and it's been fine. The component parts on all these are pretty much the same though.

Oof, the Awair Element is 230 on Walmart and 275 on Amazon. That’s a fair bit more than the 60 that GP quoted.

It's $157 now directly from their site -- $209 with a 25% off promo code.

Still way more than $60 but more reasonable for what you get. It's basically a $60 sensor that costs more because of WiFi and phone integration.

https://www.getawair.com/products/element

Yup me too. It's fairly attractive looking and integrates with your phone to view history and get alerts.

not the GP but I'm a fan of the Netatmo Indoor Air Quality Monitor. Price is fair imo (100usd), the app works well plus the data can be accessed via the web, and it includes humidity, temperature, and noise monitoring in addition to CO2 monitoring.

i only bought TFA Dostmann AirControl Mini CO2 Meter TFA 31.5006 Ambient Air Monitoring by accident, it does what it does and is super unflashy so i got another one a year later.