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

I was very pleased. Because of the ability to set the load, I was able to identify some USB cables that could not support very much current. This explains why there were some charging issues. I decided to use it to test another batch of five cables that were still packaged. Three of the five were open, no connectivity through the cable.It also helped identify a cable whose temperature rose 4 degrees in five minutes with a 2 ampere load. That cable contributed to charging issues.The current indication is also very accurate when measured with a USB Multimeter..I would recommend this. It is good controllable load. It has met all of me expectations.The photo shows it as the load for a cable being tested. The cable is held on a flat surface so that an infrared thermometer can measure the temperature at 30 second intervals.

Works well. I was able to test USB-C chargers up to 20 V and a little more than one amp. If you exceed the 25 W rating, the display reads OOP and it shuts off.

I do have one minor complaint in that this really just tests at 5v without having something extra, the voltage range warnings made me think the voltage was adjustable. This was probably on me for not doing enough research and it doesn't really matter for what I need to test, but I was hoping I could set it to 9v and 12v USB PD for extra testing. The description of the product didn't do a good job making this clear so I can't give the full 5 stars.Other than than this product works great. This will be useful for capacity testing some of the more questionable things I've purchased when used in conjunction with my usb power meter. A better solution than plugging my usb fan, light, and whatever else i can find into a usb hub.tl;dr Be aware that 'as is' this will only run at 5v even if the power bank or charger could deliver higher voltages.

Used this as a discharge device for devices that need to ship at a certain charge level and it works great. Love that the load is adjustable

These work as you would expect. I bought one to try and was impressed. I bought several more so I can put heavier loads on USB chargers with multiple ports.

DROF load module with fan. 5 stars with one caveat! Works great. Only issue is the PCB standoffs. No room on PCB to add nuts and use longer threaded standoffs.This is a preliminary review. DROK works at multiple voltages up to 4amps. Some reviews say there is no way to select 5v, 12v, etc. NOTE the voltage is set by the USB CABLE automatically. There are 2A, 3A, etc.; 18W, 65W, 100W, and at the moment the highest 240W. These are SMART cables and have control logic in the connector housing that sets the power to 5, 12, or other PD voltage. A basic dumb USB cable will be only 2AMPS. A cable that is MARKED 65W, 100W, or 240W, or "3.1 Amps" is required to get those power levels.I tested this DROK load unit drawing 3.7 amps at 5 volts at which point my tester shuts down. Which is normal. For newer larger batteries I used the DROK load tester with a short USB Y cable and a second resistor bank load that comes with the tester (tester had fan and heatsink). The resistor bank can be set to 1,2 or 3AMPS. If you want more load, that is how to get it. Used the DROK to add 3.5 more AMPS with fine tune adjustment. Note the fan only comes on when the unit gets hot at about 2 amps.More later...

The media could not be loaded. I like the fact that you can set the load current precisely. The load will automatically cool itself. I am using this to see how much capacity battery banks have, for real. Amazing tool.

Perfect for testing power supplies