Product Description Item Number | 1810-5254Industrial Scientific T40 Rattler CO (Carbon Monoxide) Single Gas MonitorThe T40 Rattler™ is a low-cost, maintenance-free single gas monitor designed to protect personnel from dangerous carbon monoxide gas exposure in the most extreme conditions. Despite its compact size, the T40 Rattler includes features usually found only in larger multi-gas monitors – including a large, liquid crystal display (LCD), internal vibrating alarm, audible/visual alarms and simple push-button operation.The monitor continuously displays ambient CO readings in PPM and will alert the user when gas concentrations exceed the preset low or high levels. Added features include adjustable alarm setpoints, calibration gas values, and choice of text-only display selected by the user through a simple, push-button routine. TheT40 Rattler also has a peak/hold feature to show the highest reading during a shift and includes a patented fl ip-cap calibration adapter for quick and simple calibration. The T40 Rattler operates for up to 1,500 hours on a single “AA” battery (included) and is covered by a two-year warranty from the date of manufacture. Reviews 4 Dependable + accurate Posted by Fire Chief on Jan 24th 2017 We have been using these meters for years. They are tough and reliable. A real good value.