This model is a significantly enhanced version of our 20/20 TDR. Customers were amazed by the clarity of the traces and features in the 20/20 Step TDR introduced in 2004. It outperformed even the Tektronix 1502C Step TDR, but users asked for even more. We took 8 years of customer input and combined it with18 months of engineering and testing to produce the E20/20 Step TDR. The result is a dramatically improved user interface, enhanced LCD display, new easy to use keypad with function LEDs, USB PC interface, and more.