Austin-based Chaotic Moon are developing smart tattoos which have similar fitness tracking capabilities to the wearable fitness trackers popular on the market today. The device, known as the Tech Tat contains bio-sensors which track heart rate, blood pressure and body temperature.
Placement is everything with a tattoo. It looks better, in my opinion, if you put it somewhere where it accents to your body. But, you should also keep in mind the parts that sag or wrinkle more than others. Granted if you’re wanting to be covered, just don’t put your favorites in the weaker areas ^-^