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Re: Portable CO meter

Phil, what about Gunson's offerings - I bought their GBP50 Gas Analyser a 
few years ago - seems to work quite well.  It's the one with the analogue 
scale.  Their latest one seems to have a digital readout.

It doesn't measure CO directly (even though the readout is marked as such) - 
it measures CO2 and presumes a linear relationship between them which I 
believe is valid for low values from car engines.

I set up one of my cars for an MOT using this - the professional one used by 
the MOT station which is presumably calibrated regularly was within 10%.

1984 Audi 80 quattro
1989 Audi 100 Avant