You can get an analog temperature / humidity sensor on amazon for pretty cheap. Unfortunately, they are more B2B focused these days than the B2C focus they sta

You can get an analog temperature / humidity sensor on amazon for pretty cheap. Unfortunately, they are more B2B focused these days than the B2C focus they started with, but you might also check out Awair, if you haven't seen it already. Their main product is $300 though. https://www.getawair.com/products/element https://www.getawair.com/products/element I did some quick searching on Amazon and found out that they make an Amazon-branded $70 air quality monitor. It's brand new. https://www.amazon.com/Introducing-Amazon-Smart-Quality-Monitor/dp/B08W8KS8D3?th=1 https://www.amazon.com/Introducing-Amazon-Smart-Quality-Moni... That said, I wonder if an air purifier wouldn't be a better first choice if you don't have one already. You can found a decent one for a medium-sized room around the same price point. Airthings is another brand that appears to be worth checking out. They have several different models with the entry level at $65. Ikea just came out with something inexpensive as well. https://news.ycombinator.com/item?id=29458404 https://news.ycombinator.com/item?id=29458404