1. A method for implementing non-destructive quality control of substrates for biological microarrays comprising the steps of: creating a layer of condensate droplets of a chemically inert water-soluble liquid on a surface of a substrate under inspection; said layer of condensate droplets affecting both transmission and scattering of light on the surface; and identifying a pattern of condensate droplets on said surface of said substrate under inspection, said pattern characterized by spatial distribution, average size of the droplets and spacing between the droplets, reflecting variation in wetting properties of the substrate.