title: Eyeballing.
authors.forename: D M
authors.initials: DM
authors.lastname: Jacobs
mesh_terms: D002138:Calibration / Q000592:standards; D006801:Humans; D008853:Microscopy / Q000295:instrumentation / Q000379:methods*; D014796:Visual Perception; D014894:Weights and Measures / Q000592:standards*