Power own menu:  (because I can't read that fast and it disappears quickly)

   Power on with key pressed
   PLAY  : Switch play key function
     M   : Enable USB communication
     +   : Disable user calibration parameters
     -   : Enable firmware upgrading
   LEFT  : Zero point calibrate
   RIGHT : Amplified factor calibrate


Do an eBay search for a DSO201 oscilloscope and you'll find them for 
about $80 including shipping, as of November, 2010