... 1).Measuring Range:0.4-45m/s 2).M/s,ft/h,ft/min,knots,CMM,CFM 3).RS-232 Interface for ... ”(13mm)4-digitLCDMeasurement unist Air Velocity:m/s,km/h,ft/min,knotsAir Flow:CMM(m3/min) CFM(ft3/min)Beaufort ... 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 ...