The art and science of amateur weather forecasting requires a reliable, affordable tool that is easy to set up and use. For citizen scientists, Skywarn spotters, and other enthusiastic weather bugs - Kestrel meters and loggers offer the ultimate gadget to satisfy the need for accurate data and detailed insight into the environment. Measure wind speed and chill, temperature, relative humidity, Barometric pressure, dew point and wet bulb temperature (psychrometric) with a simple, 3-button control. Features patented Impeller and Sensor Technology. User replaceable impeller and batteries. Large easy to see read LCD display with Backlight. USES : Military Search and Rescue K-9 handler Education & Classroom Use Farming & Agriculture Outdoor Sports (kite surfing, sailboarding etc..) Research & Technology Crane Operator Gliding Event Riggers Wildland Firefighters Industrial Hygiene Wind Surfing