I just thought this was so neat. It's a color-picker pen designed by Korean designer Jinsu Park.
It's basically like an eye-dropper tool on the go.

"the color picker pen enables colors in the environment to be scanned and instantly used for drawing. the sensor detects the color and matches it to the color display. then the RGB cartridge located within the pen mixes the inks together to create the color that has been scanned."
-Design Boom