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MSA ALTAIR� 2XP Charcoal Gas Detector with 1 ppm resolution is designed to detect the presence of Hydrogen Sulphide. Detector with Xcell pulse technology reduces the need for specific calibration gas and bump test. Gas detector featured with 0 - 200 ppm sensor range is ideal to work at a temperature range of -40 to 140 deg F. It is made of tough over-molded rubber armor to survive multiple 25' drops onto concrete. Detector has large monochrome LCD display