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Sensorcon Industrial CO Carbon Monoxide Monitor with Visual, Audible and Vibrating Alerts, Waterproof: Amazon.com: Tools & Home Improvement
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Sensorcon Inspector CO Carbon Monoxide Monitor with Pump and Probe, Visual and Audible Alerts, Waterproof: Carbon Monoxide Detectors: Amazon.com: Industrial & Scientific
GZAIR Travel Carbon Monoxide Detector, IP67 Waterproof Portable CO Gas Alarm for Vehicle, Aviation, Camping, Visual, Audible, and Vibrating Alerts, 2-Year Battery Life - Amazon.com