I will need an SPL meter to calibrate my HT room using REW. Most people say to pick one up at RS or ebay. Both of these appear to have same model number but are obviously very different. Which one should I get?
http://www.radioshack.com/product/index.jsp?productId=12680845#

....or one of these from ebay:

http://www.radioshack.com/product/index.jsp?productId=12680845#
....or one of these from ebay:











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