UCTRONICSElectronic USB Load Tester, Adjustable Discharge Resistor Module 35W, Test and Trigger QC2.0 QC3.0 AFC 9V FCP, Intelligent Temperature Control with Cooling Fan

This device worked great until it didn't. Some of the reviews say it has no "memory" however my issue is now the amp setting is stuck in its "memory" my device is stuck at 5.35A and I can't lower it no matter what I try to do. I don't see any memory reset option or factory reset. It appears another person had the same issue. I've emailed support we will see if and when they reply.**UPDATE**I reached out to UCTRONICS and they sent me a brand-new device that came in 2 days! This one is working great so far! Changed my review from 3-5.

This is a great device for testing USB power supplies and sources directly, or can be coupled with something like the FNIRSI FNB58 if you want to gather more data. I have run into a few cases, particularly with failing power supplies, where this device will at least show you what's happening even if the device is so far gone it can't properly power something like the FNIRSI - they make a pretty good pair.

Title explains this mod. And it also provides a bottom insulator that should be included. Thus tester works to 4V and then turns off. So testing a 5V USB battery pack is a problem unless you sit and watch for hours! When the pack shuts down this module looses the mAh & Wh data. The controller on it runs at 3.3V, so I added a LiPo battery that feeds the controller through a diode and switch. When ON the controller gets 3.7 - 0.7 = 3-3.1V. That is enough to run the display and keep the data alive after the battery has died.The display flashes LVP when the test port is empty, so you still have to plug in another pack to read the data, but it works. To bat the designers didnt use the flash memory to hold data that is likely in the PIC or AVR they lasered the labels off from!

Seemed to turn on and then blinked a few times, but then set itself to 5.35A and can't be changed with the knob anymore.I can enter the menu by holding the knob, and scrolling through all the options works so the knob is fine. But the current setting is just pegged at 5.35A which is beyond the rating of the unit, it also blinks "OPP" even though I have the OPP (Over Power Protection) set at 35W which is below the set point (5.19V x 5.35A = ~28W)Would be great if there was a way to reset the unit or reset all values to default, but nothing seems to work, I've tried all possible button combinations and hold times. Not worth the time IMO, wait for next version which will hopefully at least be reliable, and would be great with a basic plastic housing!

Maybe it's just age, but I had a hard time figuring out how to actually put on a load.But I guess it just misunderstood the directions.Once you get it, it's super easy to use.