WEATHER STSTION This GLOBE approved weather station is designed for easy installation and use by both educators and students. The industrial grade, fully assembled weather station measures wind speed and direction, air temperature, relative humidity, barometric pressure, solar radiation, rainfall, and ETo (evapotranspiration). The included WeatherHawk XP/X software allows for sophisticated data management, is easy to work with, and operates on PC-XP or Macintosh OS-X. WeatherHawk data is automatically formatted for transmission to the GLOBE program. Choose from wired (direct connect) or wireless models. The wired model includes the weather station, a 50’ weatherproof RS232 cable, a powered optical isolator, an AC power converter with 50’ extension cable, WeatherHawk IP server module, and WeatherHawk XP/X software. The wireless model includes the wireless weather station, solar panel kit, WeatherHawk IP server module, and WeatherHawk XP/X software. The wireless model features on-board 916 MHz spread spectrum radio communications for transmitting to a remote PC/Mac up to 1/2 mile line of sight.  Specifications  Sensors – Wind Speed: Sensor, Cup anemometer; Starting Threshold, 0.78 m s-1 (1.75 mph). Wind Direction: Sensor, Vane; Range, 360° mechanical, 352° electrical; Linearity, 1%; Sensitivity, 1 m s-1 (2.2 mph). Air Temperature: Sensor, Thermistor; Operating Range, -40°F to 122°F (-40°C to 50°C) 0 to 100% RH; Accuracy, ±0.9°F (±0.5°C); Interchangeability, ±0.36°F (±0.2°C). Relative Humidity: Sensor, Precision temperature corrected bulk polymer; Accuracy, ±5% for 90% to 100% RH and ±3% for 10% to 95% RH. Barometric Pressure: Sensor, Piezoresistive transducer; Range, 15 to 115 kPa (4.43 to 33.96 inches of Mercury); Accuracy, < ±1.5% of full scale reading ±1.5 kPa (0° to 85°C) ±0.443 Hg. Solar Radiation: Sensor, Silicon pyranometer; Spectral Range, 300 to 1,100 nm; Accuracy, ±2.5%; Output, 0.25 mV per W m-2; Operational Range, 0 to 2,000 W m-2; Temperature Range, -40°F to 130°F (-40°C to 55°C). Rain Gauge: Sensor, Tipping bucket; Orifice, 7.75 in2 (50 cm2); Resolution, 0.04” (1 mm). Weather Station – Temperature Range: -40°F to 122°F (-40°C to 50°C). Storage: 128 kbytes of nonvolatile Flash RAM (32,000 data points). Battery: On-board, 0.8 Ahr lead-acid. Solar Panel: 5 watt.