Combustion Analyzer, Electrochemical Sensor, Battery Pack/Life Span AC Adapter (100 To 240v) , Internal Battery Pack, 8 Hrs, 0.1 to 100.0% Combustion Efficiency Range, Display 160x160 (2.5x2.5"") Graphic Liquid Crystal, Temp. Range Ambient Air: -4 to 999 F, Height (In) 13.5, Width (In) 18.5, Depth (In) 9, Housing Hard Shell Suitcase Style, Standards EPA/ETVTest Verified Performance, Includes 12"" Sample Probe, 15 ft. Hose Assembly, Built-In Printer
I thought it doesnt work because it is so quiet. Execelent product from Bacharach with many addons such as Bacharach ECA450 Combustion Analyzer,Multi-Gas Model: 24-7221.