>Paul,
> In all likelihood you have hit on the problem. The OM1 uses the
PX625
>mercury cell at 1.35v . When the improper cell is used (ie a PX625A
>(alkaline at ~1.5-1.55v) the reading on the meter is around 2 1/2
stops
>off. Other replies will most likely follow with more detail. The
meat
>of the matter is you have the wrong cell.
I use a 1.4V hearing aid zinc-air battery. It measures less than 1.4V,
which is close enough for me. They are cheap and available.
Be seeing you.
Dirk Wright
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