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The U2 is a USB power meter and tester.

Overview

Features

It is full of features and makes it the most complete USB power meter I known of:

  • wide voltage and current range, with high precision: 0-24 V DC @ 0.00001 V, -5-5 A @ 0.00001 A (covers all standardized USB voltages and currents)
  • multiple USB inputs (USB 3.1 type-A plug, micro-USB, USB-C) and outputs (USB 3.1 type A socket, USB-C)
  • large (1.77 in / 4.5 cm) clear (can use large fonts) LCD screen (160*128 pixels)
  • can detect charger compliance/profile: Apple (5V @ 2.4A, PD), Samsung (5V @ 2.0A, AFC), USB Battery Charging (BC1.2 DCP), Qualcomm Quick Charge (QC 2.0, QC 3.0), USB Power Delivery (PD 2.0, PD 3.0, E-Marker), Huawei (FCP, SCP), MTK (PE1.1, PE2.0), OPPO (VOOC, DASH, Super, FLASH)
  • external power input: to not affect the current measurement, the device can be powered using the micro-USB HID plug. This also allows to measure voltages under 4 V (the minimum required if you power using the normal USB port)
  • computer interface to read the measured values: USB HIB (micro-USB port which also can externally power the device), and Bluetooth (U2p version)

Resources

The manufacturer is called WITRN. The device was first called WEB-U2, but now they registered the trademark/brand Qway to fight piracy.

You can buy the device from the official store witrn on taoboa. The software also points to the probably authorized re-seller GUZt.
The manual warms about the clones from ATORCH.

The official website is rather empty. It only point to the user guide and software (with broken link).
Instead they recommend to follow the QQ group 313755927.

Here links I could gather to get the latest version of:

There is also this thorough review with a lot of information in the comments.

Hardware

There are several versions of the hardware.

WITRN U2 104083

This is the first device I bought from the HiDANCE store, and seems to be a clone.

The original manufacturer blocked this device. After flashing firmware version 5.5, the display would just show 104083 ERR, and the device would not work anymore. Moreover it was not possible to re-flash it anymore. Thus don't install firmware version 5.5 of later if you have a device with serial 104083, else you will brick it. Software version 4.0 or later also do not work with this device. You need to use version 3.0.
This device can still be used to measure voltage and current, but since there is no update anymore it will not be able to be used to detect charger profiles.

I read out the FRAM (where the settings are stored) but did not find the serial number in there. I also cleared it to confirm the serial is not stored in the FRAM, but in the firmware. Sadly the firmware is read protected.

There is also a footprint for an Bluetooth adapter behind the screen, but it was not placed yet (the software was probably not ready).

WITRN U2 V2.0

Because the clone was bricked, I got a genuine replacement.

A Bluetooth module could be placed on the front side of the bottom board. The front board could also be light bz LEDs from the back side.

Qway U2p

The U2p version is a variant of the U2 with 4 button instead of 2, and a switch to enable Power Delivery probing

Finally it was also possible to get a version with Bluetooth and some light next to the USB input (not sure when it is on though)

Software

Support

Communication

USB HID

Bluetooth Serial

web-u2.1568027274.txt.gz · Last modified: 2024/01/07 17:49 (external edit)