The Tektronix XYZs of Oscilloscopes has had several "reincarnations", each one using the current "low-end" scope in current production. The original offering of this publication (and sometimes the original is often the best) used the T900-series scopes as their "demo" model. These have always been free publications, available from your local Tektronix Field Office, and the paper version is better than the .pdf version.