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Both the  RKI GX-3R 4 Gas Confined Space Monitor and Gas Clip Technologies Multi-Gas Clip can be used to measure oxygen, carbon monoxide, and hydrogen sulfide in the field. If you need help choosing between the the two, use the following guide to select the best option for you and your team. Gas Monitor Size The GX-3R is known as the industry’s smallest gas monitor, measuring just 2.2 x 2.55 x 1.02 inches. The Multi-Gas Clip is slightly larger at 2.4 x 4.7 x 1.2 inches. Weig …