Pico Technology 9311-20 PC USB Oscilloscope:

20 GHz bandwidth and 2 channels
Time-domain reflectometry (TDR) and time-domain transmission (TDT) capabilities
High-speed sampling rate of 40 GS/s
Deep memory of 128 MS per channel
Advanced triggering and analysis features
Compact and portable design with USB connectivity
* Ideal for high-speed signal analysis, digital design, and research applications