University of Tokyo researcher Tomoyuki Yokota showing an ultra-thin flexible thermal sensor on a plastic film at the laboratory of Professor Takao Someya, who heads a team that developed it. The thermal sensor, whose electronic circuit is just 15 micrometers thick, or about one-fourth that of a human hair, can be attached directly to the skin. Prof Someya said the sensors can be printed onto adhesive plasters to monitor body temperature, and is potentially useful for monitoring infants' health and making sportswear more comfortable. The device can measure temperatures between 25 and 50 deg C, which includes human body temperature.