By T. G. Mason and D. A. Weitz. Physical Review Letters 74, 1250–1253; published 13 February 1995. DOI: doi.org/10.1103/PhysRevLett.74.1250. The publisher's abstract reports dynamic light scattering to infer linear viscoelastic moduli from probe displacements and comparison with mechanical measurements. Publisher record and abstract. No uninspected apparatus parameters are inferred from that abstract.