There are many places online that you can go to in order to find information about mandolin vegetable slicers, including product features, reviews, ratings and pricing. A great website to read reviews is www.Amazon.com. It is hard to qualify best in this answer because I dont know what your preferences are, and "best" is objective.
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Galt Home Buying Guide reviews different brands of meat slicers and also ranks their quality by the need of the user (professional, home use, etc). Their ranking can be found here: http://www.galttech.com/research/household-DIY-tools/best-meat-slicer.php
Maintain its sharpness and cleanliness. use the thickness settings correctly. Use the safety of blade guidelines at all times.