Vigilant is the instrument that Maximum was founded on.  It’s a self-powered wind speed instrument with high gust measuring capability, so you can track the biggest winds. Wind speed is shown from 0-100 MPH and 0-160 km/h. The highest wind gust is saved with our unique Gust Register, allowing you to monitor exactly how hard the wind blew even if you are not present when it occurs. Vigilant is self-powered by the rooftop wind speed sensor and requires no batteries or other power source to operate.