Fluke co 220 carbon monoxide meter fluke fluke co 220 the fluke co 220 carbon monoxide meter makes it easy to take quick and accurate measurements of co levels with a single compact instrument featuring the newest generation of electrochemical sensors the co 220 responds very quickly to ambient changes in carbon monoxide concentration without the use of a pump br br the co 220 is the perfect instrument for technicians and other professionals who need to measure co levels within spaces