The POLI MP400 Series Multi-Gas Detector can sample by diffusion or built-in pump and offers up to 6-gas monitoring of oxygen (O2), combustibles (LEL), toxic gases, carbon dioxide (CO2), and volatile organic compounds (VOCs). It allows a full selection of sensors, i.e., electrochemical (EC), pellistor, non-dispersive infrared (NDIR) and photo-ionization detector (PID). 4 Sensor slots are available; 5- and 6-gas measurements are possible using combination sensors.