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 :-10C50 C(14F122F), 080%RH Storage environment :-20C60C(-4F140F), 080%RH