Uncle Goose , Apr 23, 2007; 05:23 p.m.
You could use silver Oxide but they are about 1.5v while mercury is about 1.35v. Now, the difference is small but you meter may be off a little bit. This is no problem if you know it and you can adjust it. On the other hand, there are adaptors available to get the voltage right or could another type op battery that gives 1.35v and use an O-ring to make it fit. Maybe some other members have better or more handy ideas.