Recently, scientists at Waseda University in Japan invented a "smart tattoo" that can be printed directly with an inkjet printer.
According to foreign media reports, this short-lived electronic tattoo can be printed at home, with low printing costs.
It is reported that this "high-tech tattoo" can detect human health problems, alcohol intake, and can also measure body temperature, heart rate, pressure level and blood pressure.
The working principle of this electronic smart tattoo is to use an inkjet printer to print a conductive black line on a movable and smooth nanosheet. The user can also choose to add some parts to the nanosheet (such as printing along the nanosheet The circuit is added with chip-shaped resistors, light-emitting diodes, etc.), and then you can detect your physical health by connecting a smartphone.
In addition, the tattoo can be attached to the skin and has flexibility, so users do not have to worry about the circuit printed on the nanosheets will be easily damaged.
Scientists expect this new invention to benefit a wide range of fields including sports training and health care. 
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