On 2011-11-01, G Morgan wrote:

I can not recommend a brand/model of stand-alone detectors, but Kidde
has a great reputation.

The CO detector I bought, which never read anything other than 30, was
a Kidde. Even when placed in propane oven. Amazon feedback shows an
astonishing number of reviews claiming dead outta the box. BTW, I
read the instructions, and having worked as a technical writer, I know
exactly what they meant. They meant the unit didn't work!

nb