Simple Solution Urinary Health Risk Indicator, 3-Ounce Simple Solution Urinary Health Risk Indicator for cats is added to any cat litter to check the pH of your cat's urine and monitor urinary health Urinary Health Risk Indicator use pH Check*, pH-indicating technology (proven to highly accurate) Quickly changes color to help you identify any potential health risks, and can detect UTIs early Simple, safe, and effective test to check your cat's urinary health without unnecessary trips to the vet Vet recommend and safe for pets