X Rite 939M on two piece cans

[DIC Australia]

Does anyone have any direct experience with the use of X Rites 939M, a modified version of 939 for use on beverage cans?

I am interested to know what kind of accuracy and repeatability you are experiencing when using these for density and spectro control?

[rich apollo]

What is the difference between the 939 and the 939M? Is this still a 0º/45º spectrodensitometer? If so, I don't think it would be appropriate.

[DIC Australia]

as I understand it it is a 0-45 degree unit, which should render it unsuitable, but the info I have is that it has been developed with extra/modified filters to allow it to give a consistent result...even on an aluminium can!!!
So far none of these are present in Australia so I am just trying to confirm the "whole truth" of their application if anyone has come across them.