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Sounds like John has outlined the pitfalls well. Surely it would be easy to do a quick calibration reading before (or during) use. Just a reading in total darkness (dark room at home, or other completely shrouded space). As Eric said, the worry is that if depleted batteries give false high readings, then how depleted do the batteries have to be before they have some (even minor) influence on the readings?
Cheers -
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