pH is a measure of acidity and alkalinity. The pH scale goes from 0 to 14. At pH 7, the half way point, there is a balance between acidity and alkalinity. Such a solution is neutral. The principles of pH begin with a definition of the term pH. The p comes from the word power. The H, of course is the symbol for the element of hydrogen. Together, the term pH means the hydrion ion exponent. Test your pH with this convenient dispenser containing a 15-foot roll of pH litmus paper. The dispenser includes a color chart to determine your pH value. Remember, the body pH value tells you how acidic or alkaline your body is, and balancing your body pH is essential for a healthy body and a major line of defense against sickness and disease.