Midas Gas Detector from Honeywell - AFC International
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GAS•TRAC® LZ-30
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Scondaor Portable 4 Gas Detector Meter, 4 in 1 Multi Gas Monitor Tester with Digital LCD Display, Rechargeable Battery Powered, Voice Sound Light Shock Alarm (Orange) - Amazon.com
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GAS-Mate® | INFICON
Briidea RV Propane Alarm, Propane Gas Detector with 85dB Loud Alarm, 1