pH Check, Acid Balance Monitor test indicates the acid or alkalinity of urine (pH) by measuring the concentration of hydrogen ions. On a scale of 1-10, 7 represents neutrality; lower numbers indicate increasing acidity and higher numbers increasing alkalinity. The pH of urine can range from an extremely unhealthy low of 4.5 to a high of 8.5. (PH ACID BAL by Test Medica)