The T40 Rattler is a low-cost single gas monitor designed to protect personnel form dangerous hydrogen sulfide or carbon monoxide gas exposure in the most extreme conditions. The T40 Rattler continuously displays ambient CO or H2S readings in PPM and alerts the user when gas concentrations exceed the factory preset levels. The monitor features a large, liquid crystal display (LCD), internal vibrating alarm, audible/visual alarms and simple push-button operation. It also has a Peak/Hold feature to show the highest reading during a shift. The unit provides maintenance-free operation using a single AA alkaline battery.

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