Kestrel Elite Weather Meter Ballistics 0857ATANDimensions: 5" x 1. 9" x 1. 1". Pack weight: 4. 3oz. Measures 14 total meteorological parameters: wind direction, wind speed, crosswind, headwind tailwind, temperature, wind chill, relative humidity, heat stress index, dew point temperature, wet bulb temperature, station pressure, barometric pressure, altitude, and density altitude. Employs the Applied Ballistics bullet library of custom drag models, an exact measurement of your bullet's drag profile