RKI Instruments offers a full range of gas detection products, from a portable confined space gas monitor to the fixed point systems. Find both single-gas (h2s monitor, o2 monitor, co monitor, etc.) and 4-gas monitors that are OSHA and NIOSH compliant. One of RKI's strengths is in their unique sensor technology. These sensors for the O2 Monitor, H2S Monitor, and CO Monitor are very small in size, have exceptionally long life, and usually cost substantially less than those of the competition.