Bought these about a year ago and just tested one of the five. It worked great. It was possible to increase 19V 4A to 32V. Like the others, you'll need a heatsink if you're going to work with more than 2A of current. My product didn't get very hot, but I haven't tried running it for hours at a load over 2A yet. It works as expected and the tension is easily adjustable. 5 stars because I have 5 of these for a great price. Even if I burn one later, I still have 4 more to test. What offer! Thanks very much! I usually prefer digital readers, but for the price I couldn't do without them.
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