Edwin G. 
Not all radon monitors sold in Canada 🇨🇦 are certified for use in Canada
https://www.cbc.ca/news/health/radon-monitor-recalls-9.7134935
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Ce ne sont pas tous les appareils de surveillance du radon vendus au Canada 🇨🇦 qui sont certifiés pour une utilisation au Canada
// Article en anglais //
Buying a radon monitor? Make sure the one you purchase actually works — and isn’t recalled | CBC News
Anyone hoping to check their home’s radon level can now pick from dozens of different radon monitors sold online or in stores — but experts warn many of those devices don’t actually work, and some have even been recalled.
Pinchy63 🇨🇦