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What are the effects of residual moisture
on zero adjustment?
The electrodes should be dried first to ensure that any zero
shift is not due to moisture left beforehand on the electrodes. Use paper
tissue for drying as above, as this is quite effective. A shift of 1 or 2
units from zero does not warrant re-adjusting the zero. The major cause of
instability of the zero is loss of integrity of the special insulation
coating on the electrodes that enable them to work as two plates of a
capacitor. A common cause of coating damage results from scratching with
cotton pliers during careless handling of collection strips.
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