WW2 British fuse setter

This is a really never used British WW2 fuse setter.
It is complete in box and still has grease paper around it.
I did not take it out of the box, because I was afraid that everything else would be covered in grease ( like my camera ).
You would have to clean it and I really believe you will then have a perfect item.
On the box there is faintly some kind of text, but I could not read it.
On the fuse setter is the text “Fuse setter hand No.1 MkI” and it is 1945 dated.
My friend told me that it was probably used to set the fuses of 25 pounder grenades.

Markings: mentioned in text and see pictures
Condition: unused