Pico Technology 2205A 2 Analogue Channels, 25 MHz, USB PC Oscilloscope, Benchtop Scope, with probes and software : Amazon.co.uk: Business, Industry & Science
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Hantek 6022BE 2CH USB Digital Storage Oscilloscope 20Mhz PC-Based 48MSa/s + WOSONTEL BNC probe : Amazon.co.uk: Business, Industry & Science
DPScope - Build Your Own USB/PC-Based Oscilloscope : 38 Steps (with Pictures) - Instructables