Airthings Wave Radon — Wave for a Colour, Know Your Radon Level, $199 CAD

Amazon.ca has the Airthings Wave Radon detector for $199.00 CAD. Also regular price, and it does the core job for fifty dollars less than the View. Prime members ship free; otherwise orders over $35 CAD ship free.

Same problem: radon is the number one cause of lung cancer among non-smokers, and it kills more than six times as many people as home fires and carbon monoxide poisoning combined. One test describes one week. A monitor describes the house — and levels swing with the weather, so a reading in July says little about January.

Wave is the simple version. Wave a hand in front of it and it glows green, yellow or red. Detailed numbers plus daily, weekly, monthly and yearly history live in the free app over Bluetooth. Humidity and temperature come along for the ride. Two AA batteries last around eighteen months, and there are no lab fees and no samples to mail away — the report generates in the app.

At 4.4 stars from 2,520 reviews and third place in Amazon's gas detector category, it's the model most people land on. Setup takes a few minutes, and it works on a shelf or on the wall.

One thing to know before buying: Bluetooth only, so readings reach you when you're in range unless you add the Airthings Hub. WiFi and a screen are exactly what the extra fifty dollars buys on the View.

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