Vigilant is self-powered by the wind speed sensor and displays wind speed (0-100MPH) and high gusts with a resettable Gust Register - no additional power source needed.
Predictor is an accurate barometer that reads from 28.5 to 31.5 inches of Mercury, has a resettable reminder needle and a precision aneroid movement. Tracks air pressure up to 6500' above sea level.
