CO or carbon monoxide chart aims to help smokers to interpret and understand the reading they get after taking a breath CO monitor test. It explains what CO does to the body and how the CO monitor or Smokerlyzer can convert the CO reading into a COHb reading. This demonstrates how much CO is in the bloodstream at the time of the test. It also give the readings for foetal blood COHb for a mother who smokes and her baby. The chart gives the readings for different breath CO monitors with a short explanation for different breath CO monitors. Invaluable for anyone testing smokers with a CO monitor or Smokerlyzer.