Clarity for your home.Start with the room and purpose
For household kit testing, EPA guidance uses the lowest lived-in level: a frequently used basement, or the first floor if the basement is not used regularly. Property transactions have a different placement decision. Choose the location before selecting power or connectivity.
Which monitor arrangement fits a basement?
| Your requirement | Starting comparison | Check before buying |
|---|---|---|
| Local readings without home Wi-Fi | Corentium Home 2 | Display averages and a suitable indoor location |
| Readings while away, plus other air measurements | View Plus | Supported 2.4 GHz Wi-Fi in the actual room |
| A local radon display near a suitable outlet | RadonEye RD200 | Plug-in power, local access and app tasks |
Use the device comparison to choose your setup. Check the room’s operating conditions and test reception there after installation.
Household testing and home-sale testing differ
The EPA Citizen's Guide, pages 5–6 describes a regularly used room on the lowest lived-in level. Its kit instructions exclude kitchens and bathrooms and specify at least 20 inches above the floor, away from drafts and adverse conditions.
For a transaction, the EPA Home Buyer's and Seller's Guide describes the lowest level that could be used regularly, whether finished or unfinished. A qualified tester should establish the location for the intended use and applicable requirements.
Ongoing observation should also have a clear location label. A basement record and an upstairs bedroom record answer different questions. Keep the records for different rooms separate.
Follow the exact model's instructions
| Model | Placement or operating information in the checked documentation |
|---|---|
| Home 2 | Manual: approximate breathing height, at least 3 ft (90 cm) from doors, windows or vents; avoid direct sun, moisture and movement |
| View Plus | View-series manual: at least 1 meter from vents or windows when wall-mounting; avoid very dusty or excessively damp conditions |
| RD200 | FAQ: operating range 32–104°F and relative humidity below 80%; check the supplied instructions for the actual position and clearance |
The Home 2 manual, View-series manual and RD200 FAQ are model-specific sources. Apply the operating limits at the location required for your test.
For View wall mounting, use the full manual's minimum one-meter distance from vents and windows.
Arrange power and access around your test spot
Home 2's batteries remove the need for an outlet at the measurement position. A compatible hub arrangement adds off-site access. View Plus connects through supported Wi-Fi; RD200's app uses local Bluetooth. See remote-access arrangements.
Arrange power and connectivity around the required test location.
Conditions for a short-term test
For a defined short-term test, follow its closed-house instructions. Keep windows closed and open outside doors for normal entry and exit. Keep an existing radon-reduction system operating; check the rules for ventilation equipment that draws outdoor air inside.
For a property transaction, EPA's home-sale checklist calls for at least 48 hours, or longer when the device requires it. For a 2–4-day test, maintain closed-house conditions for at least 12 hours beforehand and throughout the test. Follow the applicable checklist and local requirements.
Before starting the measurement
Record the room and floor, purpose, exact model, units and start date. Keep the device in its chosen position and its air inlets clear. Preserve the record before moving or resetting it; offline history needs particular care.
Follow the kit or monitor instructions for test conditions and use the duration guide to distinguish a first reading from a completed test.
Documentation used
- US EPA — A Citizen's Guide to Radon (2025)US public guidance · checked 2026-10-12
- US EPA — Home Buyer's and Seller's Guide to Radon (March 2024)US public guidance; property transactions · checked 2026-10-12
- Airthings — Corentium Home 2 user manual v1 (June 2025)Manufacturer instructions · checked 2026-10-12
- Airthings — View series manualManufacturer instructions; connection, power and display behavior · checked 2026-10-12
- Airthings — View Plus starter guideManufacturer instructions · checked 2026-10-12
- Ecosense — RD200 FAQManufacturer instructions · checked 2026-10-12
- Airthings — Home 2 SmartLink connectionManufacturer instructions · checked 2026-10-12