Condometric: Condom with ruler not for use in U.S., Liberia, or Burma
Yes, the "Condometric" is a condom with a ruler on it. No, I do not know where you can buy them in the States. (The company that makes them is in Spain.) Yes, I do know a similar product, the Peter Meter, is available for just $3. No, I will not tell you how I know this. (Okay: Google.)
Bananas can be purchased at your local grocery.
Condometric product page [Curiosite]

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Wow! I'm better hung than I thought.
Oh, wait, that's centimeters. :(
But...why would I want to use a condom to figure out how long my banana is?
And should I take this with me to the grocery store and measure my banana there?
Or should I wait until I get home to do my banana measuring?
Or does the size of my banana even matter?
I'm pretty sure you have to measure your banana in the grocery store, so you know just what you are buying.
This just makes me think of xkcd. http://xkcd.com/236/
This can only lead to sadness
enjoy my elastic ruler.