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First Alert CO-FA-9B review

£19.99 Typical price

Test score %

Reviewed

Our tests show that you can’t rely on all carbon monoxide alarms to alert you when you need it most – but is the First Alert CO-FA-9B one of them? We put it through a battery of tests to find out, including exposing this carbon monoxide detector to four different levels of the poisonous gas and assessing its instructions and the clarity of its alarm.

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Technical specifications

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Test results

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

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We have tested 21 carbon monoxide detectors and found that there are 4 Don't Buys and 17 Best Buys.
Range of Carbon monoxide detector scores
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Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

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