DS-2040CA Digital Oscilloscope: 1.DC-40MHz,dual channel color display 2.1GS/s real sample,50GS/s equivalent 3. ... w/USB interface MCH Digital Oscilloscope,DS-2040CA Digital Oscilloscope,dual channel,color dispaly,40Mhz bandwidth.Specifications: SpecificationsDS-2040CAChannels 2+Ext.Trigger ... notice. MCH Digital Oscilloscope,DS-2040CA digital oscilloscope,40Mhz bandwidth,color display,dual channel