D10 · Radon manometer versus radon test

ALT TEXT
Two-panel diagram showing that a U-tube manometer indicates system pressure or airflow while a separate radon test measures radon concentration.

LONG DESCRIPTION
A two-panel diagram distinguishes an active-system U-tube pressure indicator from a radon measurement device. The left panel shows a manometer attached to a vent pipe and explains that it indicates pressure difference or airflow condition, not radon concentration. The right panel shows a separate indoor radon test that reports concentration in picocuries per liter for the measurement period.

Source basis: Michigan EGLE (2025), “Even homes with radon mitigation systems should test every two years”; U.S. EPA Consumer’s Guide (2025).
