The all new Testo Model 350 is the most innovative portable combustion analyzer to date. Keystone features of the Testo 350 include interchangeable, pre-calibrated sensors with temperature control; a CO sample dilution system for test range expansion; complete, onboard sample conditioning; and an abundance of opportunities to interface with the entire system. The cells of the Testo 350 can be easily replaced or exchanged for greater testing flexibility.