Saving the Set Scale value

[OSTrust]

 
I am new to ImageJ and it is very good but I have one problem.
 
In the 'Analyze' column there is a 'Set Scale' option and this is quite easy to set relative to a .jpg image of a Graticule which I use on my microscope.  However, when I close ImageJ down, the Set Scale value that I have set is lost and I have to reset it every time I use ImageJ, which can create slight inaccuracies and is inconvenient.
 
Is there any way to save the Set Scale value so that it is retained when I re-launch ImageJ on another occasion?
 
I would value any suggestions - Michael