I2418105437-01111 / 18105437-01111 M40 LEL, O2, CO, H2S 4 GAS CONFIGURATION LEL O2 H2S M40 Multi-Gas Monitor The M40 is designed to continuously detect any combination of up to four gases including combustible gas, oxygen, carbon monoxide or hydrogen sulfide. Housed in a rugged, compact 8 oz. package, this multi-gas monitor includes four discrete sensors, a large LCD readout, and a Lithium-ion rechargeable battery for up to 18 hours of continuous operation. It features 90 dB audible, visual and vibrating alarms, and an easy-to-use operating system with Duickcal calibration, Peak/Hold functions, STEL and TWA readings and a 75-hour continuous black box datalogger. Comes standard with a charger, nylon carrying case, cell-phone belt clip and calibration cup with tubing. Available with or without motorized sampling pump. Carries UL and CSA approvals.