Here's something I picked off ebay;

This guy can test most 2 / 3 lead components (transistors,triacs,thyristors,diodes, LEDs, resistors, caps...) AND identify their leads as well.

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It helped me weed out all the bad mosfets I had in my junkbox, and identify the generic type of devices on which the markings had got erased.

Thought it would be useful to folks on the forum.

Regards,

Anand