Pac® 6000 Monitor, Single Gas, O2Personal single gas instrument monitors for oxygen Small and ergonomic 2 year lifespan Easy, single handed operation Designed to withstand the toughest environments Bump testing (qualitative function check) of the sensors, is a recommended function and requires test gas cylinders and bump test accessories Emits an audible multi tone signal, as well as vibrating alarm Store up to 60 events with dates and times No. of Detectable Gases: Single Hazard: O2