Monstrous Halloween Discounts | Up To 70% Off


Mouse over to zoom in

RD UM24C USB 2.0 Color LCD Display Tester Voltage Current Meter Voltmeter Ammeter Battery Charge Cable Impedance Measurement Communication Version

RD UM24C USB 2.0 Color LCD Display Tester Voltage Current Meter Voltmeter Ammeter Battery Charge Cable Impedance Measurement Communication Version

Price on the app only:

Already have TOMTOP APP

Scan the product's code to buy directly!

Note: Please update TOMTOP App to the latest version.


Download freely and enjoy extra offers!

Ship From:
  • China Warehouse
Please select a warehouse
Usually will be shipped in business days hours
The request failed! Please try again.
Sorry, it seems that there are no available shipping methods for your location.Please contact us for further assistance.


Ship to

United States
Stock in: china


Please select a color

For each user order no more 5 item(s)

Special discount has ended

Please note each user for only 1 item(s)

Preorder Add To Cart Out of Stock

Arrival Notice

if the goods arrival in 90 days,we will inform you by email!


Arrival Notice

Notification Subscription Success!

if the goods arrival in 90 days,we will inform you by email!

Notification Subscription Failed!

Error appeared,Please try again later!

Arrival Notice

Buyer Protection

  • Full Refund If you don't receive your order
  • Full or Partial Refund , If the item is not as described Learn More >
This USB Tester can measure voltage, current, power, temperature and other values and display on the 1.44" color LCD Screen.

1.44 Inch color LCD display makes it easy and clear to read.
Adjustable multi-angle view, more intelligent and convenient.
Mini size and sandwich design structure, durable for use.
Main functions: voltage/current/power/capacity/energy detection, quick charge recognition, data storage, etc.
Wide applications: can be used to test power bank, charger, discharge load, tablet, mobile phone, etc.

Model: UM24 / UM24C(Optional)
Voltage Measurement Range: 4.50-24.00V                          
Voltage Measurement Resolution: 0.01V
Voltage Measurement Accuracy: ±(0.2%+1 digit)
Current Measurement Range: 0-3.000A                       
Current Measurement Resolution: 0.001A
Current Measurement Accuracy: ±(0.8%+3 digit)
Capacity Accumulation Rannge: 0-99999mAh                     
Energy Accumulation Range: 0-99999mWh                         
Time Measurement Range: 0-99h 59min 59s
Load Impedance Range: 1.5-9999.9Ω                                   
Temperature Measurement Range: -10°C~100°C                  
Temperature Measurement Error: ±3°C
Screen Brightness Setting: 0-5 Level                                     
Auto Screen Off Time: 1-9mins
Voltage Graphing Range: 4.5-24.0V                                     
Current Graphing Range: 0.00A-3.00A
Data Storage: 10 Groups
Quick Charge Recognition Mode: QC2.0, QC3.0
Display Screen: 1.44 Inch Color LCD Display                       
Refresh Rate: 2Hz                                                                      
Product Size: 71.1 * 31.8 * 11.3mm(UM24); 71.1 * 31.8 * 12.4mm(UM24C)   
Product Weight: 20.75g
Package Size: 91 * 64 * 18mm
Package Weight: 48g(UM24); 52g(UM24C)

1. UM24 is no communication version, UM24C is conmmunication version by BT connection.
2. PC software only supports PC window 7 and above.

User Manual, PC Software Installation Instruction and PC Software and Android APP Download: 

For Android APP:
A: It only support for Android 5.0 and above; 
B: Allow APP not to be cleaned in the background; 
C: Allow APP self-starting; 
D: Allow APP not to be cleaned after screen locked.

Package List:
1 * USB Tester

Customer Questions & Answers

Sort by:
0 votes

Anyone experience that it only plugin with the display face down?

  • Mine plugged in face up on one laptop, but face down on the other. It depends upon what you are plugging it into. There is no standard for this.

    By B. Vincent on May 13, 2018


Post a new topic

Please note that TOMTOP Forums are a community for all communicating and getting help each other. There will be some enthusiastic friends participate in your discussions. Of course TOMTOP customer service (with tomtop customer service icon) response is guaranteed ,which is the same way you contact us at

open this forum in full page
Customer Reviews

Average Rating:


based on 11 Customer Reviews

  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 stars

Share your thoughts with other customers and get Tomtop Points, the first 5 reviews get DOUBLE Tomtop Points!

Write a Customer Review
  • By ***

    March 24, 2019

    Edit - I feel stupid all the scratches were on a clear screen protector. I just peeled it off and the screen is not scratched at all. This unit arrived today on time. When i opened it looked well packed so either this unit was scratched at the factory or I was sold a used item. See the pictures all the scratches both front and back. It works fine, I connected it to my laptop via Bluetooth everything works as it should. Just cosmetically it's a disaster.

    Is this helpful? (0) (0)

  • By d***u

    March 16, 2018

    This is the best USB tester ever !!!! Very accurate high quality Android and PC software Bluetooth connection very nice packaging highly recommended !!!

    Is this helpful? (0) (0)

  • By t***l

    February 17, 2018

    Work good

    Is this helpful? (0) (0)

  • By j***e

    February 13, 2018

    Correct description and fast delivery! Only positive! +++++++++++++++++++

    Is this helpful? (0) (0)

  • By m***t

    February 12, 2018

    Good item, fast delivery.

    Is this helpful? (0) (0)

  • By A***0

    February 10, 2018

    Good tester! best for this price!

    Is this helpful? (0) (0)

  • By f***m

    February 3, 2018

    All as described. Quality is good.

    Is this helpful? (0) (0)

  • By i***2

    January 28, 2018

    It's real good device and fast delivery !

    Is this helpful? (0) (0)

  • By Y***9

    January 25, 2018

    Excellent tester, dispatched in 2 weeks to Russia. You can download software and manuals open this link

    Is this helpful? (0) (0)

  • By a***s

    January 24, 2018

    Excellent! Very cool tool. I very satisfied. Recommended.

    Is this helpful? (0) (0)

  • By m***m

    January 20, 2018

    Good Ruideng USB tester up to 24V and 3A. I've bought bluetooth version. Tested, works fine. Recommend for buying

    Is this helpful? (0) (0)

Top Sellers More>

Please activate your account first. We will resend the activation email to help you complete your registration.

Recently Viewed


TOMTOP use cookies to give you the best shopping experience. If you continue to use our services or create a new account, we will assume that you agree to our  Privacy Policy.

Tell us which product you want to Social Saving

Click the refresh verification code