You can find these boards on eBay unpopulated.
They are about 50 for $7.00
You solder a MOSFET or BJT (as desired) to a board.
Solder 3 header pins to the through holes.
Plug the board into your solderless breadboard when needed.
Make test circuits up on a solderless breadboard, you can test 33 transistors in just a few minutes.
Takes only seconds to measure strategic voltage points: Vbe, Vce, V(RC).
Takes 5 seconds to measure HFE using an Arduino component tester or a DMM that has a built in BJT tester.
