ZB-A colour tester Measure ISO(R457)and Rz,Rx,Rz and yellowness index IntroductionZB-A colour tester is the ... ,opacity, transparency, light scattering coefficient,optical absorption coefficient, and ink absorption value.It is widely applied in paper, cardboard textile ... the color of object , report diffuse reflectance factor Rx, Ry, Rz;stimulus value X10, Y10, Z10;chromaticity coordinate x10, y10, ...