Quote Originally Posted by Shaggy
Hi Joe,
The battery is a PX625 or PX13 @ 1.35V not 675. It's quite possible that old age has finally caught up with it.
Have you checked out the contact in the battery compartment? You can clean them with an eraser if they are slightly dirty, tarnished or corroded.
Mea culpa. Sorry about the numbering confusion. It's what I get for posting without double-checking after a week on vacation. The old mercury battery was a 625, but the current 675 hearing aid air-zinc battery with an O-ring or PVC spacer will supply a proper voltage for the meter to work correctly.