This is a step in the right direction
http://en.wikipedia.org/wiki/Particle_counter

Looks like they're $1000-2000 USD
http://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&SearchText
=particle+counter
On Dec 13, 2012 9:56 AM, "Andrea Mazzolari"  wrote:

> Hi all,
> i need a portable instrument which allows to classify a clean room
> measuring the airborne particles sizes.
> Could anyone suggest a tool which allows such measurement ?
>
> Best regards,
> Andrea
>
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