DSO 1022 PC Based USB Digital Oscilloscope 40MSa/s 20 Mhz Bandwidth 2CH Cost-effectiveness PC Based Oscilloscope DSO 1022 20MHz bandwidth 2CH scope 40MSa/s sample rate, with 2pcs probes Operating System: Windows7,Windows Me, Windows NT, Windows 2000, Windows XP ,VISTA USB2.0 interface, no external power source required, easy to use.