This handy tool detects the current maximum and average wind speeds within 1% and is used when recording runners' race times. Measures speeds at 5, 10, or 13 second intervals. Choose from any measurement unit, it reads in tenths, and has the ability to lock in data. It contains a 400-hour lithium battery for lasting use. Plastic impeller is weather resistant and will not corrode. Mounts on an adjustable tripod. Lanyard included.