... except solution or liquid samples, others all can test, such as: powder, board, paper, paste, sheet, clay,etc.A ... this instrument can be widely measured the whiteness value of any substances. Such as: powder, board, paper, paste, sheet ... Fish Balls (paste),etc² Paper making industry: Paper Factory (paper/sheet), Printing Factory (paper/sheet), Publishing Company (paper/sheet), etc² Textile industry: ...