Thanks for the feedback, Kevin. I did calibrate it, it needed a small adjustment (1/3 stop or so). What has happened with the meter I do not know, just got it second hand, but its in fine shape for it's age. Ít seems to be accurate , once I adjust it's asa speed, but further testing is needed to know for sure though.

I now recall that you should keep it away from heat, thanks for reminding!

I guess there is no way it could regain it's sensitivity?