223 Radon Detector
User Guide
Radon Detector
Library Lending Program
Health Canada recommends long term testing of at least 91 days, but for screening purposes a minimum short term lending period of 28 days will provide an indication of radon levels in the home.
Device Instructions
- Using a paper clip or pen, press the RESET button.

- The display will read CAL and countdown. The display will flash with no numbers for the first 24 hours.

Placement
- Select a room on the lowest level (basement or 1st floor) where you spend at least 4 hours per day level (e.g., office, family room or bedroom).

- This monitor is for indoor use only. Place on a flat surface such as a desk, table, bookcase, or shelf.
Place in a room with below 85% relative humidity.
Leave undisturbed during testing period.
DO NOT place in direct sunlight.
DO NOT place in a bathroom, kitchen, laundry room or furnace room.
Results
Above 200 Bq/m3:
If the long-term results exceed Health Canada’s recommended guideline of 200 Bq/m3 , take the steps to reduce your exposure to radon. To learn more, visit the Take Action on Radon website at takeactiononradon.ca/protect/reducing-radon.
200 Bq/m3 or below:
If the long-term results are below the recommended guideline, you may purchase a digital detector such as this one for continuous radon monitoring or a 91-day single use long-term test kit. Continuous radon detectors may be easily purchased in hardware stores or online. To purchase a long-term single use test kit, visit takeactiononradon.ca/test-for-radon/radon-test-kits.
FAQs
To learn more about radon, we encourage you to read the three brochures that were provided with your library radon testing kit:
- Radon Gas: It’s In Your Home
- Take Action on Radon Bookmark
- Radon: What You Need to Know
For detector FAQs or troubleshooting, visit help.airthings.com and type HOME in the search bar.
ACKNOWLEDGEMENTS
The Radon Detector Library Lending Program is made possible thanks to the following generous supporters:
Results
Above 200 Bq/m 3:
If the long-term results exceed Health Canada’s recommended guideline of 200 Bq/m 3 , take the steps to reduce your exposure to radon. To learn more, visit the Take Action on Radon website at takeactiononradon.ca/protect/reducing-radon.
200 Bq/m3 or below:
If the long-term results are below the recommended guideline, you may purchase a digital detector such as this one for continuous radon monitoring or a 91-day single use long-term test kit. Continuous radon detectors may be easily purchased in hardware stores or online. To purchase a long-term single use test kit, visit takeactiononradon.ca/test-for-radon/radon-test-kits.
FAQs
To learn more about radon, we encourage you to read the three brochures that were provided with your library radon testing kit:
- Radon Gas: It’s In Your Home
- Take Action on Radon Bookmark
- Radon: What You Need to Know
For detector FAQs or troubleshooting, visit help.airthings.com and type HOME in the search bar.
USER GUIDE
Radon Detector Library Lending Program
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