... 1).Measuring Range:0.4-45m/s 2).M/s,ft/h,ft/min,knots,CMM,CFM 3).Air Direction:16 ones ... Air Velocity: m/s, km/h, ft/min, knots Air Flow: CMM (m³/min); CFM (ft³/min) Beaufort Scale: Force Wave Height ... ft/min ±(2% + 1ft/min)knots (nautical MPH) 0.8-88.0 0.1 knots ±(2% +0.1 nots)Air FlowCMM (cubic ... /min) 0-9999 0.001 to1 ±(2% +1m³/min)CFM (cubic ft/min) 0-9999 0.001 to1 ±(2% +1ft³/min)Beaufort ...