MAX/MIN/AVG function of GVDA High Precision Anemometer GD155 Digital Handheld Anemometer Waterproof Wind Speed Meter Outdoor Measure Windsurfing Tester
Press the 
key (≤1 Sec.) to turn on the maximum function, and then press the key 
to cycle through the maximum, minimum and average values. Long the 
key press (>1 Sec.) returns to normal measurement function.
