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CD Pocket Scales.
They look just like a CD � until you open the cover. Inside is a precision balanced digital scale, accurate to within .01 g. The CD pocket scales are available in a number of covers � or you can insert your own to fit your CD collection.
Some features to look for when you�re comparing pocket scales include the following:
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Because you�ll be carrying the scale with you, it�s important to buy one that�s designed with protection of the delicate mechanics in mind. Look for rigid covers that prevent anything from resting on the weighing surface.
Expansion Trays.
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One of the nicer features of some pocket scales is a cover that doubles as an expansion scale, making it easy to weigh things that are too large for the weighing surface. Expansion trays also mean that dust and residue doesn�t remain on the weighing surface itself � you just wipe out the expansion tray instead of scraping the surface.
� Ben Anton, 2006