Check the listing for details. UEi C161 - Residential Combustion Analyzer. Condition: New. Listed at 550.00 USD. The UEi C161 Residential Combustion Analyzer is a reliable tool designed specifically for analyzing combustion gases in residential settings. With the trusted UEi brand behind it, this analyzer provides accurate and precise measurements to ensure optimal functioning of heating and cooling systems. This unit is essential for professionals in the HVAC industry looking to maintain and improve indoor air quality for residential customers.