mColorMeterLite

mColorMeterLite is a screen color picker which displays color values in RGB, HEX, HSB, XYZ, xyY, Lab, LCH, and CMYK formats.

Handy hot keys are provided to easily copy color values to clipboard. It shows color values in multiple color models/encodings at the same time. You can see color values in just what color space/profile you want.