... Rz,Rx,Rz and yellowness index IntroductionZB-A colour tester is the professional instrument to test the object of ... , y10, z10;lightness L*;chrominance a*, b*;chromaticity C*ab;hue angle h*ab;dominant wavelength λd, excited ... color difference ΔE*ab, lightness difference ΔL*, chromaticity difference ΔC*ab, hue difference ΔH*ab, Hunter system L, a ... *264*400mmNet Weight:23kg ZB-A colour tester--LCD display