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That thing looks like a great idea to me. I saw a show once about high tech sniffers that try to mimic a dogs nose for sniffing out tiny amounts of dangerous or hazardous materials. It was pretty amazing how good it was. They use it to determine different kinds of plastics and such too.
Just last night there was a documentary on about how household mold in low rent housing and asthma among the residents has a direct link. Just being able to aim a pocket device, or a USB thumb device + apps, and find out about this sort of thing is definitely a worthwhile thing.
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