Backed by UEi Service+ to give up to 10 years’ warranty, next day recertification, and a reduced cost of ownership. The C165+OIL Residential/Commercial Combustion Analyzer is easy to use with a rugged design, multiple sensor protections, altitude compensation and differential pressure. Prints to optional printer and wireless App. The new LINK feature connects the included wireless pipe clamp temperature probes and other optional probes to the C165+OIL. Essential information for installing and maintaining gas and oil-fired appliances.