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There's an English company called Gunson that make equipment like this for the hobby market. Having bought some of their stuff I find it to be over priced for what it is...
...if you must buy a CO meter I'd go for old school 1980s second hand stuff that has been calibrated recently.
Unless you're working as a professional I would argue that this type of equipment is a bit more than is needed. If you have a decent multimeter with a Duty cycle function (and you realise that Mercedes quote their duty cycle values differently from most meters!) you are going to be able to tune the emissions as well as any "shop" - CIS is essentially so simple it all comes down to the oxygen sensor - if you can check that functionality via mulimeters or oscilloscopes then you're 95% of the way there.
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