Measuring range: 0 - 100 % rH, -80 . +250C temperature, 0, 05 , 20 msec flow velocity, Accuracy:0, 1 % rH, 0, 2 . 0, 5% of scale temperature, 01 % flow velocity, Hold, MinMax-memory, auto-off-function, RS232 or USB port, calculation of enthalpy, et cetera.