Liquid pH measuring strip, used for drinks, has backing card with publicity message and explanation of graduated scale

摘要

The pH measuring strip, named pH-mania (RTM), is given away with drinks that have a wide sale. It comprises a pH measuring strip (1) attached to a rectangular backing card (2) measuring 8 x 3 cm with a space (3), for offset printing of a publicity message and another space (4) giving an explanation of the graduated pH scale.