Withings Body Smart Wi-Fi Scale, Black
A Wi-Fi and Bluetooth smart scale with a color display that tracks weight to 50 g, body composition and heart rate at each weigh-in, and syncs with Apple Health.

The Temtop C1 measures indoor carbon dioxide from 400 to 5000 ppm using an NDIR sensor, with a listed accuracy of ±40 ppm +5% of reading in the 400-2500 ppm range and a 5-second refresh, per the listing. It also shows temperature (14°F to 140°F) and humidity (0-99% RH). The buzzer and screen light can be turned off. It's USB powered and can run on its battery; the listing recommends keeping it plugged in for real-time monitoring. A bracket is included.
Stuffy-room tiredness usually means high CO2, and this makes it visible so you know when to open a window. Useful on a desk, in a bedroom or a meeting room.
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