MSA ALTAIR 4X Portable Multigas Monitor is designed to detect LEL, oxygen, carbon monoxide and hydrogen sulfide. Durable Monitor offers 4 yr sensor life which is 60% longer than the industry average and 24 hr run time exceeds the industry average by 71%. It is suitable for confined space, combustible detection, toxic detection and oxygen detection. Monitor has ribbed rubber housing to offer firm grip and high durability. It features economical construction which saves over 50% on calibration gas, replacement sensors and maintenance. It has two-tox CO/H2S sensor to practically eliminate all cross-channel interference. Monitor can be used in low-light conditions with large buttons and high-contrast screen for easy operation. Unit comes with 95+ db alarm, ultra-bright LEDs and the exclusive end-of-sensor warning cautions user when unit's sensor requires to be changed. Monitor has MotionAlert option to signal others that user has become immobile and InstantAlert provides manual alarm to alert others of a risky situation. Monitor is an ideal match for industries ranging from fire fighting to welding. Monitor has digital sensor output making it less likely to suffer from RF interference. It withstands a drop of up to 20' and utilizes less than half as much calibration gas as the industry average. DUE TO THE SHELF LIFE OF GAS SENSORS, MOST MULTI GAS MONITORS ARE MADE TO ORDER BY THE MANUFACTURER. PLEASE ALLOW EXTRA TIME FOR DELIVERY OF THIS PRODUCT.