Litmus paper is commonly used to determine the pH level of a fluid by comparing the color of the litmus strip to a reference chart. However, some colors on the chart are similar, making visual identification difficult. The document proposes using a camera phone to take an image of the litmus strip and reference chart. An image processing program on the phone would then match the color of the strip to the chart and display the pH level on the phone screen. This automated method could help those who have trouble visually distinguishing colors, such as the elderly or colorblind individuals.