Particle counter

From: Harold Holland <*harl<-a*> Date: Thursday, September 18, 1997 · harl<-a

Is there an inexpensive particle counter on the market to monitor
the effectiveness of HVAC filtering systems.

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                  Conservation DistList Instance 11:28
                Distributed: Tuesday, September 23, 1997
                       Message Id: cdl-11-28-013
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