Digital all the way. I've never seen them as cheap as $10, but Radio Scraps has great ones ranging from $20 all the way up to $50. However, unless you are building an incubator, there is really no need to be accurate to within a degree, so the $10 ones should be just fine. Most slitheries will be quite forgiving up to several degrees variation from "ideal".
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- Ken LePage
http://www.invictusart.com
http://www.invictusexotics.com
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