Professional UEi C161 Combustion Analyzer designed for accurate measurement and analysis of combustion gases in boilers, furnaces, heaters, and HVAC systems. Features a large backlit display, real-time CO, CO2, O2, temperature, and efficiency readings for fast diagnostics and system performance testing. Ideal for HVAC technicians, gas engineers, maintenance professionals, and industrial applications. Durable, reliable, and easy to operate for precise combustion analysis.