Designed for the in vitro determination of body-fluid pH in the 4.5–7.5 range. Typically used to measure vaginal pH, including detecting amniotic fluid in late-term pregnancy, a sign of premature amniotic-sac rupture, nitrazine-indicator paper is also used to aid in diagnosing bacterial vaginosis, measuring ocular pH, and more. Packaged in a familiar, convenient, and easy-to-use dispenser and includes a color chart. Each roll provides approximately 100 tests.