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Industrial Scientific is pleased to offer the M40, a versatile multi-gas monitor capable of detecting O2, CO, H2S and combustible gases for a wide variety of hazardous and confined space applications. The M40 is housed in a rugged, impact-resistant case to provide superior performance and durability in harsh environments and resistance to radio frequency and electromagnetic interference. Its four button interface provides simple, intuitive operation and calibration, and the M40's five-second "Off" feature prevents unintentional shut-offs. The unit's compact size and economical price make it an ideal personal monitoring instrument.