Visual Colorimeter for Lovibond RYBN Scale, The Model F, is a visual colorimeter designed to optimize using Lovibond glass filters to express color in terms of Lovibond Red, Yellow, Blue, and Neutral.
Visual Colorimeter for Lovibond RYBN Scale, The Model F, is a visual colorimeter designed to optimize using Lovibond glass filters to express color in terms of Lovibond Red, Yellow, Blue, and Neutral.