Wow..
Didn't know there's is a chemical sensing device until this post..
These devices are often cheap, small and rugged.
Wish many can get to see this post. Thanks for sharing @greenrun and I already resteemed to share this knowledge.
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Yea. There're chemical sensing devices out there in the market but the selectivity and sensitivity matters. If both properties are not right, you tend to get a false alarm or sometimes the alarm fells. So before you purchase any, try to find out reviews on both properties.