Japanese Product

I haven't found a product yet, but here are some websites I've been looking at.

http://www.japantrendshop.com/pocket-metabolism-checker-p-511.html

http://www.funzug.com/index.php/unusual-things/coolest-japanese-products-you-must-use.html

http://www.oddee.com/item_96451.aspx

I am leaning towards the first link, which is the pocket metabolism checker, but not completely sure yet.