Techkon USA introduces the latest functions of their SpectroDens™ 4 spectrodensitometer, including OBA-Check™ and visual opacity measurement functions. SpectroDens 4’s measurement function, OBA-Check, provides precise information about the intensity of the optical brightening agents used and the shade of the paper. SpectroDens 4 is the first color measurement instrument to offer a visual opacity of printed white ink measurement function. It allows a user to measure and monitor opaque white ink's hiding power, as it is commonly referred to.