Oh no, Stretch, I appreciate you keeping the conversation going.

One thing I see lacking in threads is solutions being posted.

I don't like open-ended conversations.

I am guilty of dropping the ball; I've done it in the past. But I try to be

consistent and diligent closing deals.

That being said I will keep up with this thread until I get my hands on a CO

meter, try it out and post my results.

Evaluation of Three Low Cost Exhaust Analyzers
 

Here's a well prepared document of the test of some older analyzers

https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=910123W7.TXT

I'm working with TWD about obtaining his Heathkit

This is one of the units in the study conducted by Southwest Research Institute