---
product_id: 123259070
title: "USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete"
brand: "deegoo-fpv"
price: "£1.03"
currency: GBP
in_stock: false
reviews_count: 9
url: https://www.desertcart.co.uk/products/123259070-usb-tester-um25c-usb-meter-tester-voltage-current-bluetooth-battery
store_origin: GB
region: United Kingdom
---

# Color LCD Display Bluetooth Control High Precision USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete

**Brand:** deegoo-fpv
**Price:** £1.03
**Availability:** ❌ Out of Stock

## Summary

> 🔍 Discover the Power of Precision!

## Quick Answers

- **What is this?** USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete by deegoo-fpv
- **How much does it cost?** £1.03 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/123259070-usb-tester-um25c-usb-meter-tester-voltage-current-bluetooth-battery)

## Best For

- deegoo-fpv enthusiasts

## Why This Product

- Trusted deegoo-fpv brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Quality Assurance:** Identify charger and cable quality to avoid fakes and ensure reliability.
- • **Customizable Display:** 1.44-inch full-color LCD with 64 color options for personalized viewing.
- • **Precision Measurement:** 5-digit high precision readings for voltage, current, and power.
- • **Seamless Connectivity:** Control via Bluetooth with mobile app or PC software.
- • **Fast Charge Recognition:** Supports QC 2.0/3.0 and various charging standards for optimal performance.

## Overview

The USB Tester UM25C is a versatile and high-precision USB meter that allows users to monitor voltage, current, and power through a Bluetooth connection. With a vibrant 1.44-inch color LCD display and support for various charging standards, this device is essential for anyone looking to ensure the quality and efficiency of their charging equipment.

## Description

Via Bluetooth connection, you can use mobile phone APP or PC control the USB tester. PC software support PC window (Win 7 and above) and Phone Android (Android 5.0 and above, support 14 kinds language, chinese, english and Russia .... ) Parameter / Useage: USB 2.0 / 1.44 Inch Full-Color LCD Display Tester, 5-digit High Precision; High Resolution; Foreground and background colors are switched alternately , with 64 options to choose; Upgrading USB A Female and Male Port--It can measure input Voltage, current, power, capacity, energy. Load access detection function, after the tester screen puts off, plug in the load and the screen will light up automatically. Support Micro USB or Type C Connector and fast charge mode recognition,It can recognize QC 2.0/3.0,for Apple 2.4A/2.1 A/1A/0.5A,Android DCP，etc....Measure wire resistance by Differential pressure method.Gold-plated USB contacts and upgraded USB male female connector. Widened Power Cord make it own 5A high current. Application in varieties of test:PC/Laptop/Desktop Computer/Mobile Phone/Power Bank/Charger/Discharge Load/Car Charger/Cable Impedance Measurement. Can identify the quality of the charger, charging cable, charging treasure, data cable, the true and false mobile power capacity, from then bid farewell to be fooled, bid farewell to fakes!

Review: The Ruideng UM25C USB power meter with bluetooth, best for hackers and nerds - Much of good reviews for the unit is for a Ruideng model, I do not know if clones exists as it is sold by many vendors under different brands, but this unique design functionally works very well. The company has fielded many models and whomever engineers this is worth watching, as he knows his stuff, so getting an actual Ruideng is a must if you want a bluetooth USB power meter. The photo for the product shows a USB test load, which is not included. As devices use USB power standard, being able to optimize charging using the right cable and supply can be confusing since users can't determine whether a cable is truly a power capable, or a USB A jack can supply more than 5V. Weakening batteries can be estimated by determining the Ah required to charge a battery. Pros Boot screen shows Ruideng logo, V2.0 excellent protective box for storage and transport Accurate at minimum to its spec of 0.5% VDC and 1% ADC compared to a fluke 87V and HP6114 precision power supply Stable and correct data collection over 24 hour period of test burn in BT pairing, Win10 and Android apps quick and work without glitches or dropouts; data is stored on the dongle and only data since pairing is graphed to the apps Win10 program has undocumented feature of adjusting graph scale, just click highest axis digit and type new value PC app is based on National Instruments libraries, well known for reliability easy to read bright LCD screen, easy to navigate for dongle only usage design pays needs of USB, such as rotating screen due to multiple positions USB can be put in heavily reviewed elsewhere for accuracy, reliability and performance box comes with QR code to link URL with software for unit Cons cable resistance algorithm is helpful but not as accurate as it could be, can be used to compare cables but not actual cable resistance fast charging algorithm identification is vague if correctly identified, but is not vital to know confusing versions of variant models from Ruideng that all look the same, so users have to read carefully what they do documentation can be confusing for non nerds as different models are very close to each other Arial Unicode MS fonts are included in package and should be installed but cannot force Win10 to use it, so the font on app is a bit large for the screens and aphanumerics can bleed off their placeholders Cannot resize scale on Android app App only recently appeared on Google Play, so users should be aware of issues loading APK from unverified sources PC app loads slowly because it copies a large number of libraries. Its a bloaty for what it does but it works reliably
Review: Truly Awesome! - This is a great tester! I really love the upgrade from the A3-B that I have. The screen is flush to the face and seems much clearer and slightly brighter. The color, brightness and orientation of the display are easily configurable. Power can be input from USB-A, Micro-USB, or USB-C and will pass out through the various connections (example input micro-USB and output USB-A or input USB-A and output USB-C or C-to-C.) I have not tried every combination, I do not believe that C->A works for example. The Bluetooth interface to the Android App is interesting, but I mostly use the built-in display. I like that they added the micro-switch to disable Bluetooth and the annoying flashing blue light also. I have been successful with QC2.0 and QC3.0 as well as many PD standards up to 60+ watts and PPS works with my Note 20 Ultra 5G when the source supply is capable. The triple-sandwich PCB in this model is quite sturdy, and seems to better reinforce the connectors and wedges the display in place (older models had issues with the display losing tack and rotating slightly due to no stops.) Highly recommended. You will see quickly which cable / power supply combinations are best matched and whether your setup is faulty (bad cable or power supply.) I see that many USB-C cables will not carry more than 20W due to high resistance, and some power supplies will compensate, some won't. I have been successful passing data and power through USB-C to a dock that drives displays / ethernet etc. with 45-50W PD.

## Features

- Via Bluetooth connection, you can use mobile phone APP or PC control the USB tester. PC software support PC window (Win 7 and above) and Phone Android (Android 5.0 and above, support 14 kinds language, chinese, english and Russia .... )
- Parameter / Useage: USB 2.0 / 1.44 Inch Full-Color LCD Display Tester, 5-digit High Precision; High Resolution; Foreground and background colors are switched alternately , with 64 options to choose; Upgrading USB A Female and Male Port--It can measure input Voltage, current, power, capacity, energy. Load access detection function, after the tester screen puts off, plug in the load and the screen will light up automatically.
- Support Micro USB or Type C Connector and fast charge mode recognition,It can recognize QC 2.0/3.0,for Apple 2.4A/2.1 A/1A/0.5A,Android DCP，etc....Measure wire resistance by Differential pressure method.Gold-plated USB contacts and upgraded USB male female connector. Widened Power Cord make it own 5A high current.
- Application in varieties of test:PC/Laptop/Desktop Computer/Mobile Phone/Power Bank/Charger/Discharge Load/Car Charger/Cable Impedance Measurement. Can identify the quality of the charger, charging cable, charging treasure, data cable, the true and false mobile power capacity, from then bid farewell to be fooled, bid farewell to fakes!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07PZRSYXD |
| Best Sellers Rank | #1,017,628 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,596 in Multi Testers |
| Brand | Deegoo-FPV |
| Brand Name | Deegoo-FPV |
| Color | Gold |
| Customer Reviews | 4.3 out of 5 stars 85 Reviews |
| Manufacturer | Deegoo |
| Measurement Type | Ammeter, Multimeter, Voltmeter |
| Part Number | SNS-192-B07PZRSYXD |
| Power Source | Battery Powered |
| Style | Digital |
| Style Name | Digital |
| UPC | 608603912425 |

## Product Details

- **Brand:** Deegoo-FPV
- **Power Source:** Battery Powered
- **Style:** Digital
- **Color:** Gold
- **Measurement Type:** Ammeter, Voltmeter, Multimeter

## Images

![USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete - Image 1](https://m.media-amazon.com/images/I/61qTcS++OSL.jpg)
![USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete - Image 2](https://m.media-amazon.com/images/I/71LjX7gMp9L.jpg)
![USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete - Image 3](https://m.media-amazon.com/images/I/61ODXyNvxVL.jpg)
![USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete - Image 4](https://m.media-amazon.com/images/I/71yQGthsgeL.jpg)
![USB Tester UM25C USB Meter Tester,Voltage Current Bluetooth Battery Power Charger Voltmeter Ammeter Multimeter Tester, 1.44 Inch Color LCD Display USB 2.0 Type- C Cable Resistance Load Impedance Mete - Image 5](https://m.media-amazon.com/images/I/51NPVcagoWL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The Ruideng UM25C USB power meter with bluetooth, best for hackers and nerds
*by Z***Z on May 6, 2019*

Much of good reviews for the unit is for a Ruideng model, I do not know if clones exists as it is sold by many vendors under different brands, but this unique design functionally works very well. The company has fielded many models and whomever engineers this is worth watching, as he knows his stuff, so getting an actual Ruideng is a must if you want a bluetooth USB power meter. The photo for the product shows a USB test load, which is not included. As devices use USB power standard, being able to optimize charging using the right cable and supply can be confusing since users can't determine whether a cable is truly a power capable, or a USB A jack can supply more than 5V. Weakening batteries can be estimated by determining the Ah required to charge a battery. Pros Boot screen shows Ruideng logo, V2.0 excellent protective box for storage and transport Accurate at minimum to its spec of 0.5% VDC and 1% ADC compared to a fluke 87V and HP6114 precision power supply Stable and correct data collection over 24 hour period of test burn in BT pairing, Win10 and Android apps quick and work without glitches or dropouts; data is stored on the dongle and only data since pairing is graphed to the apps Win10 program has undocumented feature of adjusting graph scale, just click highest axis digit and type new value PC app is based on National Instruments libraries, well known for reliability easy to read bright LCD screen, easy to navigate for dongle only usage design pays needs of USB, such as rotating screen due to multiple positions USB can be put in heavily reviewed elsewhere for accuracy, reliability and performance box comes with QR code to link URL with software for unit Cons cable resistance algorithm is helpful but not as accurate as it could be, can be used to compare cables but not actual cable resistance fast charging algorithm identification is vague if correctly identified, but is not vital to know confusing versions of variant models from Ruideng that all look the same, so users have to read carefully what they do documentation can be confusing for non nerds as different models are very close to each other Arial Unicode MS fonts are included in package and should be installed but cannot force Win10 to use it, so the font on app is a bit large for the screens and aphanumerics can bleed off their placeholders Cannot resize scale on Android app App only recently appeared on Google Play, so users should be aware of issues loading APK from unverified sources PC app loads slowly because it copies a large number of libraries. Its a bloaty for what it does but it works reliably

### ⭐⭐⭐⭐⭐ Truly Awesome!
*by D***Z on November 4, 2020*

This is a great tester! I really love the upgrade from the A3-B that I have. The screen is flush to the face and seems much clearer and slightly brighter. The color, brightness and orientation of the display are easily configurable. Power can be input from USB-A, Micro-USB, or USB-C and will pass out through the various connections (example input micro-USB and output USB-A or input USB-A and output USB-C or C-to-C.) I have not tried every combination, I do not believe that C->A works for example. The Bluetooth interface to the Android App is interesting, but I mostly use the built-in display. I like that they added the micro-switch to disable Bluetooth and the annoying flashing blue light also. I have been successful with QC2.0 and QC3.0 as well as many PD standards up to 60+ watts and PPS works with my Note 20 Ultra 5G when the source supply is capable. The triple-sandwich PCB in this model is quite sturdy, and seems to better reinforce the connectors and wedges the display in place (older models had issues with the display losing tack and rotating slightly due to no stops.) Highly recommended. You will see quickly which cable / power supply combinations are best matched and whether your setup is faulty (bad cable or power supply.) I see that many USB-C cables will not carry more than 20W due to high resistance, and some power supplies will compensate, some won't. I have been successful passing data and power through USB-C to a dock that drives displays / ethernet etc. with 45-50W PD.

### ⭐⭐⭐⭐ Super accurate! Works well with app.
*by J***S on June 29, 2022*

I found to my surprise, that this little tester Exactly matched my high end Agilent multimeter (60,000 count U1253B, tested at .03% DC error +/-2 div) on voltage and within 2 counts on current. So for a device costing well over 10 times less than my meter, that's very good! It works perfectly through the standard USB A to A connectors. The USB C connectors are a bit different. I found it will not identify the charge mode. I also found if you connect from a charger/battery bank via a USB A to a USB C cable and connect to the tester via USB C, that the device being charged apparently is not communicating to the charger what mode to use. Therefore, you're stuck at 5 volts at whatever the receiving device takes. This is due to the limited connectivity usage of the USB C connection to the tester's processor. You will even likely need to occasionally turn a cable around in the input connection to get the tester to power up. For me this isn't a real big deal. If you connect USB C all the way through, your receiving device (likely a phone) will communicate with the charger. The tester, in my case never identified the mode using the C connection. In all other respects though, this tester is awesome! The accuracy is well worth the downside of the C connection issues. The Bluetooth works perfectly and even allows you to power it off if you don't need it. The app worked well for me. I simply needed to see the readings. Connection was a snap. Those having an issue likely never paired the tester before running the app. It must be paired. Then you simply tap the Bluetooth icon, and find the UM25 on the list and tap it, and it connected. Simple as that. My only gripe is that it should remember this device or have an option to. Still, not a big deal. My reason for 4 instead of 5 stars is the lack of complete usefulness of the C connections. If this is your main usage, you need to get a dedicated C tester.

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-31*