"ALLOWS USER TO SELECT THE CARRIER GAS (O2 OR AIR); INTERNAL PUMP; MEASURES VAPORIZER OUTPUT CONCENTRATION USING A DIGITAL LCD DISPLAY READOUT; MEASURES CONCENTRATION IN PERCENTAGE FOR DESFLURANE (SUPRANE SEVOFLURANE, ISOFLURANE (FORANE) AND HALOTHANE); INCLUDES SAMPLING TUBE, CARRYING CASE, SAMPLING ""T"" PIECE"