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Carbon Monoxide Detectors-When Zero Doesn't Mean Zero

Watch 3 carbon monoxide (CO) detectors react to increasing levels of CO. All 3 detectors do a great job, but the professional grade detector is the most sensitive (because it costs more/and therefore should be more sensitive). Always read the owner's manual that comes with the CO detector so you know its operating characteristics. I suggest that you always take a CO detector with you when you travel. And if you are a scientist like myself, carry a professional grade detector with you at all times (perhaps 2 CO detectors--am I over-cautious?). 400 people die in the U.S. every year by accidental CO poisoning (and I don't know the world-wide death rate???). Of course you know CO is odorless and colorless and binds to hemoglobin with an affinity 200X that of oxygen. Hence it is called the "silent killer".