Of the numerous dessicating (drying) agents available, I recommend those
based on silica gel, preferably in a small porous paper or cloth bag.
They are clean and dry, and can be regenerated by heating.  Just put a fresh
one in the sealed bag or box with the computer or monitor.  This will
take care of small amounts of moisture that find their way into the sealed
bag or box.

You should be able to find them at camera shops and other places that receive
high-tech equipment.  Often, they are thrown out with the excess packing.
These would do, but should be regenerated by heating to 225 F for, say 20
minutes, and kept in a sealed plastic bag until just before use.  If you
use one that has been left out in the open for a few days, it will have
picked up its quota of moisture, according to the Relative Humidity at
the time, and instead of drying the air in the box, it could actually keep
the air humid.

Avoid those based on deliquescent salts such as Calcium Chloride.  They
dry the air by "dissolving in their own puddle" and could cause corrosion.
These are usually much bigger and would be used to dry the air in a whole
basement.

Boyd Ramsay

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