... and 5.0 um in cf or m3 Built-in flow sensor (0.1 CFM +/- 10%) Optional Temp./RH ... um, 1.0 um, 3.0 um, 5.0um Flow Rate 0.1 cfm (2.83 l/min) Light ... Frequency1 - 99 or continuous Count ModesSingle, Repeat, Continuous, Calculation and Remote mode DisplayLCD: 20 letters, 4 lines InterfaceRS232C or ... Time3.5 hrs with 1600mAh Batteries Vacuum SourceInternal pump, flow controlled DimensionsW 4.5 x D 2.8 x ...