Picture This
What it's not: An Etch A Sketch pad for electricians.
What it is: A passive voltage indicator (PVI). The ABB-designed unit may not be microscopic, but nanotechnology spawned the super-sensitive electrophoteric display material it uses to detect electric fields created by voltages less than 1kV/cm. Slap one of these smart signs on a live conductor and the black lightning bolt materializes. Turn off the power and it disappears. Call it eye candy for the safety-conscious electrician.