Spray Droplet Sizing Reticle (Matthews) - NG30
For size and distribution assessments of aerosol droplets. Used in conjunction with a 40x Microscope for direct measurements of droplets from 50-400 micron diameters. The actual pattern sizes are 50, 100, 200, and 400 microns. W.H.O. (Details on Request) and G.A. Matthews. Imperial College.