Putting in a pre-loaded Dallas or Fram will remove the 'not calibrated' indication (?????? or ............), but this will mean the scope from now on is
"Not Calibrated",
only it will not be visible to a user.
The error could be anything from 1% to 15 or more %, depending on the parameter used.
Timebase, Amplitude, Delay, etc.
Putting in a pre-loaded replacement is the ostrich way....
The only real way to go is calibration.
Just my 2cts...
Leo
satbeginner