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My experience with these instruments was quite a few years ago but I found that the desiccant is very important.? That would be the first thing that I would try.? Particularly if you are in a humid location which, since it is summer, you probably are.

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Putting a desiccant package inside never failed to cure the leakage problem for me.

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Lenox

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Does this meter require a desiccant in the can to help reduce the upscale readings?

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