... SpecificationsWhiteness meter except solution or liquid samples, others all can test, such as: powder, board, paper, paste, sheet, clay, ... etc.A & E Lab. Main Products: Atomic Absorption Spectrometer (AAS), Fluorescence Spectrophotometer, Bio-Spectrophotometer ... Digital Whiteness Meter (0-100%,LED display, touch panel, test paper, rice, flour, powder, paste)