Any people has experience on buying/using gas analyzer. The OTC
MicroGas Analyzer cost $7000. Snap-On also sells one for $7000. They
are the 5 gas analyzer, very good for the auto mechanic shops and smog
shops Then there are some analyzers made in 1970-1980-1990 as hand
held portable one gas analyzer, just CO. for $100. Namely Gunston,
Kane-may, Heathkit, Sears, Air-fuel Monitor Is it true that they
never works? and they are all out of the market now.
Kragen CSK or Napa don't have anything. Anyone use anything before?

thank you for your suggestion. I should have known better.