Ideal for confined space use, GfG’s Microtector II G450 AutoCal® Series offers compact, lightweight four-gas detection, continuously measuring CO, H2S, O2 and combustibles in ambient air. The watertight unit features an extra-large, invertible, heterochromatic display; rubberized housing; simple, three-button operation; and audible/visible/vibrating alarm.GfG Instrumentation Inc., www.gfg-inc.com, (800) 959-0329