The one they use for their DIY Kit [0] actually costs $16-19 [0] at aliexpress [0]: https://www.airgradient.com/diy/ https://www.airgradient.com/diy/ [1]: htt

The one they use for their DIY Kit [0] actually costs $16-19 [0] at aliexpress [0]: https://www.airgradient.com/diy/ https://www.airgradient.com/diy/ [1]: https://www.aliexpress.com/item/32944660534.html https://www.aliexpress.com/item/32944660534.html