Choose from sensors for detection of O2, LEL, CO, and H2S or the Duo-Tox sensor for measurements of both CO/H2S without cross interference. Housing is a compact, rugged, metal-plated case designed to withstand demanding environments. A single button controls all necessary procedures, including fully automatic calibration. Each detector is shipped with hand-aspirated sample draw kit with 10 ft. L tubing, reference manual, quick reference card, belt clip, and three AA batteries. Value Packs include the detector, all standard accessories, cylinder of all-in-one calibration gas, fixed flow rate regulator and compact foam-lined ABS carrying case.