... based on the principle of photoelectric effect & D65 light source (R457) and with 0/d or d/ ... ModelSBDY-1PSBDY-1Measurement Range0~100.0%Measurement SystemR457 Blue Light WhitenessAccuracy0.1Zero Draft0.1/10minStability0.2/10minRepeatability0.2Power Supply220V ... ---Size & Weight405X325X330mm & 6.5kg Digital Whiteness Meter (0-100%,LED display, touch panel, test paper, rice, flour, powder, paste)