Cruel Dad that I am I had my son go through my unsorted resistors with it.
That's how I learned the resistor colour code, I had a bag of assorted resistors and a small colour code wheel. After I had catalogued them all I never needed to look up a resistor again I just know the colours.
Me too, although I wish they would make the bands a bit wider, my eyesight just isn't up to the job these days.
It is a good exercise though. My son also tested them with the multimeter when he wasn't sure, so now he knows the difference between 'precision' and 'accuracy' as well!