The Point-to-Plane E.S.P. has a single grid collection surface.  It uses the standard transmission  electron microscope grid as a collection surface.  When operated at a current of 3 microamperes, and an aerosol flow rate of 100cc/min. the collection efficiency exceeds 90% for particles down to 0.01 microns diameter.                 

Stock # 02-909  Point-to-Plane E.S.P.