The RKI GasWatch 3 is a wearable single gas monitor weighing 1.6 ounces. Wear on wrist as a watch or clip to lapel, hard hat, or safety equipment with alligator clip. Five models: GW-3(O₂), GW-3(CO), GW-3(H₂S), GW-3(C-) hydrogen-compensated CO, and GW-3(CX) dual sensor for O₂ and CO.

Field-replaceable coin-type lithium-ion battery provides up to 4,000 hours continuous operation (2,000 hours for dual sensor, 2,500 hours for H₂-compensated CO). Water, dust, and RF resistant. ATEX, IECEx, CSA certified. 3-year warranty (2 years for O₂ sensor). IP66/68 rated.