Aranet
Aranet4 Home CO2 Monitor
The little device that showed me my bedroom air was wrecking my sleep. Now I won't sleep without checking it.
$199View on Amazon
I picked up the Aranet4 after writing about how stale bedroom air was quietly tanking my sleep, and it has earned a permanent spot on my nightstand.
Why I like it
- Accurate, instant readings - CO2, temperature, humidity, and pressure at a glance.
- No app required - the e-ink display just works; the Bluetooth app is there if you want trends.
- Battery lasts months - two AA batteries, not another thing to charge every night.
If you wake up groggy for no obvious reason, measure your air before you blame anything else.