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I always take this with me when I travel. It's expensive but it's waterproof, dustproof, lasts for years and there's a good insurance policy if you stay in a hotel or an Airbnb that doesn't have a carbon monoxide detector. This is an industrial-grade tool that might be Overkill for personal use but I like how rugged is it is and never have to worry about it being wet or dropped.
Purchased the "Inspector Pro". Paided shipping. FedEx calculated the tax and duties for my province of Ontario. Great product. I will be using this every day at work. I purchased it January 22, 2018. August 14, 2018 I contacted seller. The manufacturer, went to there website and called customer service. Spoke with Steve. Told him about water in the unit. Water is under the screen. He guided me through the sensorcon website. I'll be sending it in and either repaired or replaced.
Look at pictures and menu options on the manufacturer website to confirm whether you get the "Inspector" or "Inspector Pro" version. My experience is that the Inspector version is being labeled and sold as the Pro version. The unit is a lot smaller than I expected, so when I get the correct version directly from the manufacturer for the same price, I look forward to using it.
I rely on this to keep me informed about the CO at places I go to. I will not stay at a hotel unless I have this with me ; too many hotels have problems with their pool heaters, water heaters and other gas burning appliances. I was also at a restaurant with a defective gas fireplace, and I alerted the manager and they fixed it. This is a professional unit, and you can keep it on all the time. After it alarmed in my pocket while mowing my grass, I bought an electric mower. Most people would be shocked how much CO a gas mower coughs up. These last about two years, then I get a new one. I won’t be without it.
I don't really use this viced in the industrial setting for which it was intended, but I was willing to pay a bit more for an "overbuild" of my actual requirements. So from my semi-professional use it seems to be very well built, rugged, and -- based on initial use over a few months -- I expect it to be a reliable and useful tool for many, many years (realizing the unavoidable degrading of the sensor over time).
Though I don't have the strict industrial or occupational safety requirements that some may have, as an "informed layman," this seems like a very high quality, professional-level product at a fairly reasonable price. Appropriate I'd think for everyone except the most budget-concision consumer.
I maintain a brewpub, including a commercial kitchen. Some of our kitchen staff decided that they were being exposed to hazardous levels of CO, so I bought the Inspector Pro. I left the unit in the kitchen, in a place that would be exposed to the same levels as our crew, for the weekend. The TWA feature is perfect for this, as is the Max value. The TWA for any period over the weekend was 0ppm. Max for the entire weekend was 2ppm. Lawsuit avoided! I'm also a Coleman lantern enthusiast and am looking forward to seeing what CO levels I'm exposing myself to with these. This unit is tiny. Unfortunately, the instructions are tinier.