Battery Powered SD Card Data Logger by Logic Energy - made in the UK. Accepts data from one or two wind speed sensors, one wind direction sensor (potentiometer type), and combines with time/date stamp with current temperature. Stores data on a removable SD card for analysis in spreadsheet. Requires SD card reader (not included). Sensors additional - ORDER VORTEX WIND SPEED SENSORS from Inspeed (see Associated Products). For wind speed and direction, contact us for further information. For more information, see www.inspeed.com.