... of controlling the machining precision SpecificationsWhiteness meter except solution or liquid samples, others all can test, such as: powder, board, paper, ... Refractometer, PH/DDS/TDS Meter, etc.Application:This instrument based on the principle of photoelectric effect & D65 light source (R457) and ... Digital Whiteness Meter (0-100%,LED display, touch panel, test paper, rice, flour, powder, paste)