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Well, yes, you need to pay attention to all the details. But frankly, where do you get that price range for Gysflash in your doc? You say min 750€, but I've ordered mine new shipped to Lithuania at 550€. Now can you tell frankly how much your DIY cost? Cables, voltmeter, ampmeter, clamps... I had a look at the catalogue prices, took cheapest I found and the total is easily over 300€. Plus PSU price and all those other things inside. I would say your project should have cost of over 400€. Not that big difference at all. And a week of tinkering time saved And also all those features like current limiting (I will use it for my other projects) and automatic battery charging are not there. Please correct me if I'm wrong. Of course doing without volts and amps displays would be much cheaper. I was thinking about doing one DIY myself, but then I've read about gysflash here and at that price I decided very quickly. Have not received it yet, so judging about it by the manual only yet.