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When doing serious work I use a 5 gas infrared analyzer, when playing in the field you can use a homemade wide range AFR meter.

You can get all the parts and circuit boards HERE

They work very well, as opposed to the cheap junk that is sold to hobbyists, but only when making adjustments or possibly in help when building a fuel map for something thas has alredy been built in its final form.
 
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