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  • 07/11/2020

    Good product to test USB port, power supply, power bank, USB cable, etc. I recommend. Pair it with an electrical load to test power bank and batteries.

  • 13/05/2018

    Оптимальное соотношение цена/функциональность. Версия UM25C с bluetooth модулем стоит переплаты за нее - чего стоит запись данных и сохранение в виде таблицы/графиков. Показания довольно точны.

  • 10/04/2018

    I was interesting to buy model UM24C, when I found information about this. But is good about I wait, and now I bought updated version UM25C where added couple of new features, like a support input current 5A and added USB Type-C In and Out for test cables. I take version with bluetooth. If you will try connect it to your Android device, you will need enter PIN: 1234 Cons about applications: - I'm a Mac user, so I want to have Mac/iOS version of application; - I tested Android application on Google Pixel (Android 8.1), and is still very buggy. One simple repeatable crash - Press "Scan for devices", after finish, click "No device found", and application will crash. Also after connecting, and start to receive data, application often crash after 15-45 seconds. Anyway I wish to have this application on Google Play, or Open Source. Is very interesting and powerful device, comfortable to use. I hope applications will be updated and fixed soon.

  • 24/08/2018

    It took longer than expected arriving. The USB case arrived with big scratches, I believe the shipper was careless. Luckily, the USB device is safe. It is very useful tool for me to measure and monitor all my tech activities: check my drones' batteries, check my other USB devices and do preventive measure. Very useful tool! See photo.

  • 30/12/2019

    Great tool! Crazy value for all the functionality. This device literally offers pages of information on the workings of your USB port. You can view these pages by using buttons on the edges of the device. The information is displayed on a surprisingly good color display which is also built-in.

  • 17/06/2018

    Very nice and well designed device. I checked accuracy (voltage, current and full loading of a Xiaomi Power Bank 2 10000mAh) : Excellent results ! I give a 10/10 to Ruideng and Banggood for this delivery.

  • RogVIP2

    I did a quick test of this UM25C USB tester, and found that the current measurements are measured/displayed with reasonable accuracy when compared with laboratory grade amp meter. However, the voltage measurements have a 7.5 % error, on 6.5 V actual output voltage, it measures 7 V. That is far from the claimed V: ± (0.5‰ + 2 digits). In my drawer, I have another USB tester, and that did cost me a fraction (U$5) of this UM25, but the errors in current and voltage measurements are within the expected range. Yes, UM25C is clever, colorful and pretty, but as a serious tester - it fails miserably.

  • 11/07/2018

    Excelente producto llego entre el tiempo estipulado probando con buenos resultados recomendable 100%

  • 17/06/2018

    Very nice USB voltage/current tester. Nice that have USB-C ports. It comes with embedded data logger and bluetooth interface. Tested with PC software.

  • 26/12/2018

    easy to use, clear info about charging, now available also with ios app (UM Meter). can test power bank, laptop USB, different chargers.


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