Extech sdl300 anemometer with data logger extech sdl300 the extech sdl300 metal vane thermo anemometer and data logger records data on an sd card in microsoft excel reg format for easy transfer to a pc for analysis the user can manually store 99 readings or set the logger to automatically store up to 20m samples with date and time stamp at a user selected sample rate the metal vanes withstand temperatures to 70 deg c 158 deg f and air velocity to 35m sec 6900ft minute complete with 6