The GasAlertMicro 5 from BW Technologies is a rugged, water-resistant instrument capable of simultaneously monitoring up to five gases, including combustible gases, H2S, CO, O2 and other toxic gases such as ammonia, chlorine and phosphine. Available options include datalogging, motorized pump, multi-language support and a variety of power options.BW Technologies by Honeywell,, (888) 749-8878