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SMART SENSOR AS8700A CO Gas Monitor 1~1000 ppm Carbon Monoxide Alarm Portable Carbon Monoxide Detector - AliExpress
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TRIPLETT The Triplett Model GSM120 Portable Carbon Monoxide Meter incorporates a stabilized electro-chemical gas-specific (CO) sensor to measure CO from 0 to 1000ppm. in the Air Quality Monitors department at Lowes.com
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GXG-1987 AS8700A Handheld Carbon Monoxide Meter, Battery-Powered High Accuracy 0-1000PPM CO Gas Detector with LCD Backlit Display - Yellow - Tools Products - Amazon.com
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