If you are leery of building your own Tricorder and need more that just biometric information about yourself then check out SCiO, unless you contributed to the Kickstarter and already have one.  It is a tiny mass near-infrared spectrometer which will allow you to scan objects to determine their chemical makeup and transmit the information to your phone; finally a way to compare apples and oranges!  The site also suggests you should be able to monitor the health of plants, get nutritional information on food items and even prove that there is absolutely nothing in that homeopathic snake oil other than C6H12O6 and H2O.  Other uses just suggest themselves, such as determining if jewellery is authentic or how degraded the rubber on your tires is.  Scanning an item will add it to a database hosted at SCiO, they describe it as "the world's first database of matter" others might use the phrase baseline sample.  Check it out right here if you use an iOS or Android device and there are educational kits for schools as well.

"SCiO is the world's first molecular sensor that fits in the palm of your hand. Scan physical objects and receive instant and relevant information to your smartphone."

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