[ac29]

I have a SwitchBot Meter Pro CO2 that is just temp/humidity/C02. Works well and was inexpensive ($50 or so).

[dgellow]

Do you mean that one? https://www.switch-bot.com/products/switchbot-meter-pro-co2-...

I wish they would sell just the CO2 meter, like this one: https://www.switch-bot.com/products/switchbot-indoor-outdoor...