My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?
David added in a comment:
EV3 hardware developer kit provides a bit more info on what 100% means:
The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection.