The Kane 504 is suitable for use with all common 'domestic' fuels including Natural Gas, Propane, Heavy Oil, LPG and Light Oil. (When used with oil burning appliances the flue gases should only be sampled after the smoke level has been measured and has been confirmed to be a very low smoke number.)
It uses a bespoke Non-Dispersive InfraRed (NDIR) sensor to directly measure CO2 and a long life electrochemical sensor to measure CO.
The meter is controlled using a rotary dial.