I rely on it to keep me informed about CO in the places I visit. I won't stay in a hotel if I don't have this with me; Too many hotels have problems with pool heaters, water heaters and other gas appliances. I was also at a restaurant with a broken gas fireplace and notified the manager and they fixed it. This is a professional device and you can leave it on all the time. After the bell rang in my pocket while mowing the grass, I bought an electric mower. Most people would be shocked at how much CO a lawn mower emits. They last about two years, then I get a new one. I will not be without him.
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