Correction: set to 1/3 stop lower ASA when 357 is new. Set to box speed after 2 months average use. From then on the battery holds flat until falling off a cliff after 1/2 the expected original lifetime of the mercury PX625. Keep this in mind and you wont be fishing in the dark for a film speed. Batteries tend toward the underexposure side when new, and over exposure as they age. The PX625 mercury could hold flat all its life. Silver is a fair to middling runner-up to mercury. The other technologies are no better than alkaline on that count, which is unfit for meter use.
Originally Posted by Tom1956