Air Flow meter Air flow rate range: 40...4000 m3/h Air pressure range: 700...1100 hPa Dimensions L x W x H: 150 x 35 x 85 mm Humidity measurement range: 0...100 % Temperature range: -20 ... +60 °C Wind speed range: 0...14 m/s Electrical supply: 4 x LR6/AA Instrument for: Air flow / Temperature / Humidity of Air / Pressure Measuring error, air flow: ±3% Measuring error, air pressure: ±3 hPa No. of inputs: 2 Resolution, air flow: 1 m3/h Resolution, air pressure: 0.1 hPa