Netatmo Wind Gauge has no moving parts, instead relying on four sensors that measure wind speed and directionality. The company says the gauge is accurate to around 0.5 km/hour (about 0.3 mph) in winds under 100 km/hour (62 mph). Accuracy drops to plus-or-minus 2km/hour (1.2 mph) at faster speeds, and it becomes too inaccurate to be useful in gusts over 160 km/hour (99 mph). Any hurricane over category 1 will render the Wind Gauge useless. Sorry, storm chasers.