The UM24/UM24C USB Meter by RUIDENG allows you to measure voltage, current and power consumption directly from any USB device. It’s like a multimeter for USB type devices. The UMXX USB Meter has been in our radar for a while, but we finally got it and we’ll review it in this article.
UM24 vs UM24C
The UM24 USB meter comes in two different versions: the UM24 and UM24C. The UM24C is slightly more expensive, because it has a built-in Bluetooth board that you can use to connect to an Android App or Windows PC software.
Product Details and Specifications
- Voltage range: 4.50 – 24.00V
- Voltage resolution: 0.01V
- Voltage accuracy: ±(0.2%+1 digit)
- Current range: 0.0 – 3.000A
- Current resolution: 0.001A
- Current accuracy: ±(0.8%+3 digit)
- Capacity accumulation range: 0 – 99999mAh
- Energy accumulation range: 0 – 99999mWh
- Load impedance range: 1.5 – 9999.9Ω
- Temperature range: -10ºC~100ºC / 0ºF~200ºF
- Temperature error: ±3ºC/±6ºF
- Screen brightness: 0-5 level
- Auto screen off time: 1 – 9 minutes
- Voltage graphing range: 4.5 – 24.0V
- Current graphing range: 0.0 – 3.0A
- Screen: 1.44 inch color LCD display
- Quick charge recognition mode: QC2.0/QC3.0
- Refresh rate: 2Hz
UM24(C) vs UM34(C) vs UM25(C)
There are a few types of UMXX devices (the modules with a C in front of their name support Bluetooth communication). Here’s the main specs and differences:
|USB port||USB 2.0||USB 3.0||USB 2.0|
|Expansion port||Micro USB Type B||Micro USB Type C||Micro USB Type C|
|Voltage range||4.50 – 24.00V||4 – 24.00V||4.50 – 24.000V|
|Current range||0.0 – 3.000A||0.0 – 4.000A||0.0 – 5.000A|
|Quick charge mode||QC2.0, QC3.0||QC2.0, QC3.0, Apple, Android DCP, Samsung||QC2.0, QC3.0, Apple, Android DCP, Samsung|
|Where to buy||Banggood||Banggood||Banggood|
For our needs, we’ve decided that the UM24C was more than enough, but if you need to work with USB 3.0 or detect a different type of Quick Charge mode, you can get a UM34(C) or UM25(C).
Where to Buy UM24?
Where to Buy UM24C (with Bluetooth Board)
If you decide to get the UM24C that comes with a Bluetooth board, you can download the PC software or Android App:
- PC software supports Windows 7 and above.
- Android phone supports Android 5.0 and above (compatible with 3 languages: English, Chinese and Russian) .
- You can open this link to download the PC software, Android .apk, and instructions from the official source: Mediafire download folder.
Note: the preceding download link sends you to the official manufacturer source and we haven’t tested that software. In our opinion, we think the color LCD displays everything that we need, but we like to have the option to use Bluetooth in the future.
Unboxing USB Tester
The UM24/UM24C USB Tester comes in a neat aluminium case well packed with a dense foam which holds the USB meter tightly.
Inside the enclosure, it only has the USB meter – there are no instructions or accessories.
This board comes with two USB input ports. You can either power the USB meter with a USB B input.
Or you can use the Micro USB Type B port to power it:
On the other side of the board, you have a female USB B port. Here you connect the device you want to get power measurements.
This board also has 2 buttons on each side. These buttons are used to access the menus and change the settings. The two buttons on the bottom allow you to go to the Help menu or change to the Next interface.
There are also two other buttons on top that allow you to rotate the screen orientation with a long press.
How to Use UM24 / UM24C USB Meter
For this demonstration, we’ll be powering the UM24C USB Meter with a power bank in the USB B input and use a USB cable to power an ESP32 board. When you first apply power, you’ll see the next loading screen.
These USB Meters features 7 menus:
- Main Interface
- Quick Charger Recognition
- Charging Recording
- Wire Impedance Measurement
- Voltage Graph
- Current Graph
1. Main Menu
This is the main menu that appears and it displays: voltage, current, temperature (in Celsius or Fahrenheit), group, power consumption, cable impedance and more.
When you open the Help menu, you’ll see what you can do in that specific screen. For example, with a long press you can either rotate the screen, clear the data group or change the data group.
2. Quick Charger Recognition
In this menu, you can detect the type of Quick Charge mode. In this example I’m using a power bank and as you can see it says “Mode Unknown“.
If I use my smartphone charger it detects properly as “Mode QC2.0“.
3. Charging Recording
You can define a current threshold that when triggered will record the time, and power consumption during a charge.
4. Wire Impedance Measurement
You can get the wire impedance measurement:
5. Voltage Graph/Plot
6. Current Graph/Plot
In terms of current, the ESP32 is consuming around 0.07A:
7. Change Settings
If you hold the bottom-right button, you can change the USB meter settings:
- Auto screen off time from 1 minute to 9 minutes
- Screen brightness between a 0 and 5 level
- Temperature in Celsius or Fahrenheit (the temperature range is -10ºC~100ºC / 0ºF~200ºF with an error of ±3ºC/±6ºF)
The USB meter can be a great addition to your electronics lab. It provides an easy way to measure power consumption (and other related measurements) of devices that support a USB port. In my case, the UM24 USB tester is very handy to give me an idea of power consumption of my ESP32 and ESP8266 projects.
So, to conclude, the UM24 USB meter board is very well designed and versatile. I think it is a great tool for the average maker or electronics hobbyist.
We have other reviews that you may like:
- Best Multimeters under $50 – Buying Guide and Comparison
- Best Low Cost Multimeter? ANENG AN8002 Multimeter Review
- XR2206 Function Generator DIY Kit Review
- DIY Transistor Tester Kit Review – Hiland M12864
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