Display : The top display line always shows the Velocity or volume , the bottom display line always show the temperature or humidity. Parameters: Velocity -ms,km h, fpm,mph,kts,Beaufort Temperature : °C,°F Humidity: %RH, td Resolution :Velocity :0.1ms, fpm; Sample rate : 2 time sec Operating environment :-10°C~50 °C(14°F~122°F),0~80%RH Storage environment :-20°C~60°C(-4°F~140°F), 0~80%RH