As an electrical engineer, I am very familiar with the design and testing of printed circuit boards. This test box is fully automated. I was a little skeptical at first as I was afraid I would overload and destroy the LEDs. Just connect the wires to an LED or a string of LEDs and it will automatically figure out how to regulate voltage or current respectively. I ended up buying two more for my technicians at work. English instructions leave a lot to be desired.
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