Meet the air in your home
Know your air. Room by room.
One quiet sensor turns the air in the room you care about into clear, useful next steps.
- Know when to act.See when to open a window, run your air cleaner, or keep outside air outside.
- Compare your rooms.Understand the places where you sleep, work, and spend time.
- No subscription requiredFree apps, web dashboard and account; core recommendations included.
FROM READINGS TO A NEXT STEP
A reason to open the window.
COâ‚‚ is rising and outside air is clean enough. The app suggests airing out the room for 11 minutes, then lets you follow the change.
See how the guidance works →
CO₂ · particles · VOC & NOₓ indexes · temperature · humidityMeasures your air and helps you decide when to ventilate or filter. It does not clean the air.
Everything you need to get started
In the box
- Terrestream sensor
- Power adapter and 6 ft (1.8 m) USB-C cable
- Printed field guide
- Mobile app and web dashboard
Before you order
Details
- 69 × 65 × 111 mm (2.72 × 2.56 × 4.37 in) · 6.7 oz (190 g)
- Connected features need 2.4 GHz Wi-Fi, internet and a free account.
- Plug-in only: continuous USB-C power, no battery.
- 1-year limited warranty
- Ships the next business day via FedEx.
- Return it within 30 days of delivery, even if you’ve opened and used it. You pay return shipping.
- Optional Apple Watch companion requires a compatible Apple Watch and paired iPhone, sold separately.
Common questions
How many sensors do I need?
Start with one in the room where you spend the most time. Each sensor measures the room it is in, so add more where you sleep, work or spend time and compare them in the app.
Is there a subscription?
No. The apps, web dashboard and account are free, and core recommendations are included.
What if it isn’t right for me?
Return it within 30 days of delivery, even if you’ve opened and used it. You pay return shipping. It also comes with a 1-year limited warranty, and our team can help with placement and setup.
Can I talk to someone?
Yes. Contact the Terrestream team for help choosing a setup, placing a larger order, or completing checkout. Contact us