Built with the durability and simplicity found in every Industrial Scientific instrument, the M40 is a reliable, low cost gas monitoring solution for confined space or personal monitoring applications. The M40’s rugged composite case is immune to RFI, and houses four discrete sensors, a large LCD readout, and integral lithium-ion battery for up to 18 hours continuous runtime.

The M40 continuously monitors oxygen, combustible gases, carbon monoxide, and hydrogen sulfide in any combination, activating bright alarm light, 90-dB audible and internal vibrating alarms when gas concentrations exceed the preset limits. Additional standard features include Peak/Hold functions, STEL and TWA readings, a continuous loop datalogger and ‘Quick-Cal’ calibration.