Any Recommendations on a good handheld Carbon Monoxide - CO Detector?

Looking to purchase a good/accurate reading CO detector that is handheld. Thanks for any suggestions!

I have the Fluke CO-220.


thank you!

This is what I wear. Sensorcon Inspector CO Carbon Monoxide Monitor with Visual and Audible Alerts, Waterproof: Tools & Home Improvement

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Hi Jeff, what about testing furnaces, etc. Do you always have to install its probe pump or do you use a different CO tester for that?

I use a Bacharach. It’s a great testor

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I just place it in front of a supply register.

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This is a tasteless colorless gas. It is important to have your CO tester calibrated on a regular basis.