CIE 7905C

[Vortigern]

Hi there,
I've found an old CIE (CHUNG INSTRUMENTS ELECTRONICS) 7905C multimeter, which should be equivalent to many other brand multimeters, like: Knight K-7905, Emmes, Radio App. Fabr. 7905, etc.
Unfortunately I have only the bare multimeter: no manuals, no schematics etc.
I really would like to find some more documentation about this multimeter and the differences among various issues (A, B, C etc.).
I'm also interested in a calibration procedures and schematics about this multimeter, may someone provide them?
If needed and helpful, I may provide some detailed pictures of my CIE 7905C.


Thanks in advance,
Alessio Bolognini