Portable CO Detector 3-in-1 Carbon Monoxide Detector, Alarm Temp/Humidity Detector with Lanyard and Magnetic Suction Function, Mini CO Monitor

SKU: GW40.0008

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Call your local Fire Department, see if they have the $3000 tool they use, then, they will be HAPPY to check your tool, and your building, no charge! 
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The test device detects gas in a general area. It is not a pinpoint gas location detector.