I have acquired 3 Gossen Luna Pro cds exposure meters. Two of the meters have use Mallory PX 635 or PX 13
batteries in it. Those batteries are 1.5 volt alkaline The other gossen says to use two 1.35 volt mercury cells which are no longer manufactured. I already know the alkaline cells can give erroneous readings in a long run as the power curve is not desirable. WHAT BATTERIES AND OR ADAPTERS SHOULD ALLOW ME TO USE ALL THREE METERS WITHOUT INTERNAL MODIFICATIONS ??
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