OI-315 Single Gas Personal Monitor
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The Otis Instruments Model OI-315 TOCSIN3 Personal Monitor is a personal safety device designed to detect the presence of toxic gases in ambient air. When activated, the OI-315 continuously monitors ambient air for the presence of H2S, CO, or O2 (whichever unit-type is purchased) and alerts the user to potentially unsafe exposure with visual, vibrating, and audible alarms.

The OI-315 features an alligator clip that allows it to be worn on personnel in the field at all times, as well as: rubber enclosure for shock prevention, water/dust proof enclosure, adjustable alarm set points, LCD display with LED backlight, data logging capability, user-replaceable sensor element, and user-replaceable battery.