DROK USB Load Tester, Electronic Load Test Resistor Module 25W LD25 USB and Type C Interface Discharge Adjustable Constant Current 0.25A-4A Intelligent Temperature Control with Cooling Fan

Funciona muy bien y es bastante preciso. Según las mediciones que he hecho, la corriente que se solicita sólo está desviada por 0.01A en mi unidad, lo cual es poco. Mi única observación es que el potenciometro esta un poco suelto, les faltó soldarlo completamente plano a la placa. Pero no tengo problemas, funciona excelente por el precio.

The device works well however we can only achieve 17W for some reason. We have had to use additional loads to boost the amount for our testing to 25W which wasn't ideal.

This DROK USB Load Tester is an essential tool for anyone who works with USB devices or wants to verify their chargers and cables are performing correctly! The adjustable constant current feature from 0.25A to 4A makes it incredibly versatile - I've been able to test everything from low-power accessories to high-output fast chargers. The dual interface compatibility with both standard USB and Type-C is perfect for modern testing needs since everything is transitioning to USB-C. The build quality is solid, and the controls are intuitive and easy to adjust. I've used it to identify faulty cables and chargers that were delivering inconsistent power, which has saved me from potential device damage. The intelligent temperature control with the built-in cooling fan is a brilliant feature that really sets this apart from cheaper testers. Even when running sustained 25W tests, the unit stays cool and stable. The display is clear and easy to read, giving me accurate real-time readings of voltage and current. This has become an indispensable part of my testing toolkit - whether I'm verifying new charging equipment, troubleshooting power delivery issues, or just satisfying my curiosity about how well my chargers actually perform. For the price, you get professional-grade testing capabilities that are normally found in much more expensive equipment. If you're serious about electronics, charging infrastructure, or just want peace of mind about your power sources, this is an outstanding investment.

very helpfull and good testing device good for testing power bank claims that saw well we put out 15v @ 1,5 amp well this meter you can set it to that load and than see if you some the power bank and believe me ive smoked a few with it just going 10% under normal limit from a good brand power bank seems some brands over charge their power banks a bit in the price range 20-40 euro watch it almost all fail tests and kinda begin to get verry hot to stop test for safe reasons.

Extremely handing power supply tester. I've used mine dozens of times. Many power supplies crumble in the face of this little power hog. I like to take my gear to the limit, so this tool lets me verify that the power supplies I rely on will deliver the rated power. Most do not. A few survive the test. The few that do, get to travel with me into the field. The voltage is very accurate, within about 0.1V of what I read with a fluke meter. I have compared this by putting the black lead of the fluke on the metal connector of the USB, and the red lead of the fluke on the screw of the on-board voltage regulator 3-pin device. It's awkward to hold the fluke leads like this, so it's nice to know the on-board indicator is accurate. I have yet to kill my device, but I like it enough that I decided to buy a second as a backup. My only complaint is having to toggle between voltage, current, power. I wish I could see voltage and adjust current at the same time. As a workaround, I use the DROK inline USB meter, which does a great job of showing voltage and current at the same time. One novel use of this tester is to measure the resistance (and gauge/thickness) of the wires in a USB cable. I found a lot of "high current" cables were lying - using thin wires that were too small and had too much resistance, and too much voltage loss. The way I did this was to set it up for 1A of current, measure the voltage at the power supply, then insert the USB cable, and measure the voltage again. (Vin-Vcable)/1A = resistance. Using a chart with resistance vs. gauge of wire, I was able to find some cables that were excellent, and others that were too thin to deliver the rated power for charging. This is a bit of a niche product, but if you NEED TO KNOW that your chargers deliver under load, this is the only way to go. For the price, anyone who uses USB devices (phones, tablets) and wants to know if the problem is a cable, the power supply, or something else should have one in their toolbox (along with a DROK inline USB power meter).