The one in the OP has a different collector. Presumably they&#x27;re sampling for explosives&#x2F;radioactive matter&#x2F; ...?<p>Of course it would be a great way to hide something like license plate cameras, in plain sight, with the assumption that they&#x27;re air-quality sampling systems.<p>As someone else pointed out, wouldn&#x27;t these very quickly get stolen?<p>OT: Couldn&#x27;t help but chuckle at <a href="http:&#x2F;&#x2F;www.hi-q.net&#x2F;products&#x2F;size-selective-particulate-sampling-inlets&#x2F;default.html" rel="nofollow">http:&#x2F;&#x2F;www.hi-q.net&#x2F;products&#x2F;size-selective-particulate-samp...</a> with the juxtaposition of the ISO9001 quality mark and the forgotten &quot;lorem ipsum&quot; placeholder text ...