While litmus paper is common, it cannot tell you how concentrated the acidic or basic solution is. Thus many prefer to use universal indicator paper as the strip can turn into multiple colors and shades depending on the concentration. The strip can then be compared to a col...
描述Litmus Red Test Paper, 10 Booklets of 20 Strips 主要特点 Color changes instantaneously, simply compare to chart for determination Available in two convenient formats — a booklet of 20 strips, 7 x 70 mm; or a single 9-mm wide roll in a convenient dispenser ...