I recommend the CHRIS adaptor highly. I use them in my Leica CL camera, Weston Ranger and Metrastar meters as well as a couple of other cameras and the exposure meters were near spot on when compared to using the PX625. I do agree that if the unit can be recalibrated to use an alkaline battery it would be a godd way to go, maybe the better though more expensive than the CHRIS. I had my CL gone through just before the mercury battery issue arose but, if it needed any other work again, I'd have it recalibrated.