Welcome to the world of inexpensive sensors for clinics, offices and homes

A new simple tool developed by nanoengineers at the University of California, San Diego, has opening up a wide range of possibilities for people to build and use sensors, Imagine ballpoint pens filled with high-tech bio-inks that can be used to detect glucose levels in diabetics, measure pollution on leaves or could be used on the battlefield to detect explosives and nerve agents.