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AJ-933 Standalone Smoke And Carbon Monoxide Detector (2-in-1) With10-Year Tamper-Proof Battery - SAFE-TECH - A British Brand Specialising in Home and Safety Protection
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Handheld Carbon Monoxide Meter, Portable CO Gas Detector, Gas Tester with 0~1000ppm Range, 1PPM Resolution(Battery NOT Included) - - Amazon.com
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