... (R457)and Rz,Rx,Rz and yellowness index IntroductionZB-A colour tester is the professional instrument to test the object of ... absorption coefficient, and ink absorption value.It is widely applied in paper, cardboard textile, painting ,chemical building materials, plastic , cement ,food ... 40mmSize and WeightDimension:360*264*400mmNet Weight:23kg ZB-A colour tester--LCD display