Testo 350 XL flue gas analyzer equipped with O2, CO cells (with shut-off and purging functions), NO, NO2 , with differential pressure measurement, 2 sockets for temperature probes, gas preparation compartment, system adapter for data transfer – Testo data bus, automatic purge with fresh air via valve (incl. extension of the measuring range with dilution factor 5 for all cells), integrated rechargeable battery, data memory. The device can be retrofitted with a maximum of 6 electrochemical cells (with H2S, HC, SO2, CO2 NDIR)