... rate 3.2channle, color display 4.with USB interface MCH USB Oscilloscope, DS-2025CA Digital Oscilloscope, 25MHz freq. ,dual ... rate500MSa/aEquivalent sample rate50GSa/sInput impedance1MΩ//13pFInput couplingDC, AC, GNDTriggerEdge, video, pulse, delayAcquisition modesAuto, normal, singleTrigger sourcesCH1, CH2, Ext, ... notice. DS-2025CA USB Oscilloscope, 25MHz freq.,dual channel digital oscilloscope