How does a typical toxic gas monitor look like?
See picture above to get a fairly good idea.
Can one keep it in a pocket?
Of course, one can. In fact pocket type or clamp on toxic gas meters are meant for just this purpose, a gas meter that can be clamped to your dress and which continuosly monitors the air that you breathe in, 24 X 7. However these smaller sized detectors usually are meant for detection of a single gas, say Hydrogen Sulfide or Chlorine. Thus the pocket gas detector then tends to be referred to as a Hydrogen Sulfide monitor or a Chlorine monitor.
