Lunasix 3 (black or grey)?

I have two of them sitting in front of me...one in grey (made in Germany (West)) with a D5 serial number prefix, the other in black (made in Germany) with a 3B serial number prefix.

Does anybody know if there are any differences between them, other than age? (assuming the grey one is older...it looks it.)

(I'm aware of the battery issue - and a few of the ways around it)

Dave

have a look at the gossen web site they have (or did have) a fair amount of info on their older meters i believe from looking at this issue a fair while age the grey (older) ones are no longer servicable by them but the black one including the gossen luna six and luna pro etc are stil servicalbe by gossen also i think gossen ofer a conversion kit for the batery but have a look