The ALTAIR 4X is an extremely durable Multigas Detector that simultaneously measure up to four gases from a wide range of XCell(R) sensor options including combustible gases, O2, CO, H2S, SO2 and NO2. The ALTAIR 4X Detector surpasses industry standards in several crucial areas. Its four year sensor life is 60% longer than the industry average, while its 24 hour run time exceeds the industry average by 71%. This versatile portable detector is a perfect match for industries ranging from fire fighting to welding, and its digital sensor output makes it less likely to suffer from RF interference