Hi @bean USB SS (3) would probably have increased the price. AD3 pros vs AD2 - USB-C, more power - adjustable system frequency between 50-125MHz - reference clock IO - high precision trigger position, Scope and Logic Analyzer - 2X and shared scope buffer, with one channel enabled provides 64Ki samples (4X) - 2-4X buffer for the other instruments - higher record rate, up to 10MHz with one channel - 16 bit averaged scope sampling - more Scope channels: Wavegen 'digital'