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USB Power Meter

4.2 out of 5 stars 61 customer reviews
| 13 answered questions
Price: $29.95
Sale: $19.95 & FREE Shipping on orders over $49. Details
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    This fits your .
  • Enter your model number to make sure this fits.
  • Digital display shows clear and accurate numerical readings
  • A "must-have" product for testing USB devices and chargers
  • Compatible with USB 3.0, USB 2.0, and USB 1.1 ports and devices
  • Multiple modes allows the user to measure real-time voltage and current
  • IMPORTED FROM JAPAN
115 new from $19.95 1 used from $16.96
$19.95 & FREE Shipping on orders over $49. Details In Stock. Sold by Playtronics LLC and Fulfilled by Amazon.

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Frequently Bought Together

  • USB Power Meter
  • +
  • PowerJive USB Voltage/Amps Power Meter Tester Multimeter, Test speed of chargers, cables, capacity of power banks
Total price: $29.94
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Product Information

Product Dimensions 0.4 x 0.9 x 2.6 inches
Item Weight 0.5 ounces
Shipping Weight 1.1 ounces (View shipping rates and policies)
Manufacturer Centech
ASIN B00DAR4ITE
Item model number Centech
Customer Reviews
4.2 out of 5 stars 61 customer reviews

4.2 out of 5 stars
Best Sellers Rank #5,009 in Computers & Accessories > Computer Accessories > Cables & Interconnects > USB Cables
#24,637 in Electronics > Accessories & Supplies > Cables
Date first available at Amazon.com July 24, 2013

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers
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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsVery useful for evaluating chargers and monitoring charging
By Ron Perlman on August 22, 2013
Verified Purchase
The description and technical details of this listing is very vague. I bought this purely on faith that it worked as I expected (as there were no reviews at the time) and was pleasantly relieved that it meets my expectations.
If you read no further, I think this meter is great and would recommend it. I use it to test 3rd party phone chargers and cables and was surprised to find out how differently they perform.

The company that makes this is Centech and their web site is here:
http://www.centech.jp/
Using Google Chrome, you can visit the site and use the translation feature to read it in English.

Technical Details.
Most of this information is from the manual which is very brief. I've attempted to upload a scan of the one useful page (the rest of the 4 page manual is warranty, saftey considerations, and liability.) It's hard to read, so here is the text of that manual (below). It appears this has a 2.00 Amp current maximum rating, 0.05 Amp minimum for a reading, and uses 0.01 Amp power, which should be fine for nearly all casual uses. All readings are from the main 5V power line (red pin 1) on USB. (The data + and data - lines are not monitored.)
2.00 Amp maximum current.
0.05 Amp minimum current.
0.01 Amp power draw (to power the meter.)

FROM THE MANUAL:
Specification
Current Value(A) | Error +/-2% max (+/-0.04 max for 0.1~2.00A)
Voltage Vlaue(V) | Error +/-1% max (+/-0.05V at 5V)

Major Components:
USB connector (male USB plug)
LCD Display
Mode Button
Target Device (female USB port)

Operation:
1. Please connect the USB Power Meter into the host machine.
Note: At this time, no target device should be connected.
2.Read more ›
5 Comments 58 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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4.0 out of 5 starsVery useful USB power meter for checking quality of cables, charging rate of battery packs
By M. Erb #1 HALL OF FAMETOP 10 REVIEWERVINE VOICE on January 6, 2014
Length: 3:08 Mins
A USB power meter can be extremely useful in troubleshooting USB connections to devices and/or just getting a grip on charging rates of USB batteries, general health of your USB ports, etc.

It's a simple device to use. The power meter circuitry is enclosed in a rigid and seemingly well made clear housing. On one side is a LCD display and a small circuit board mounted button. The button allows you to cycle through the 4 modes available to you when using the power meter:

- (A) Current in amps with an error of +/- 2% max (0.04 max): The measurement range is apparently 0.05A - 2.0A
- (V) Voltage with an error of +/- 1%: The measurement range is apparently 0.05V - 5V.
- (PA) Peak Current: Maximum current value is updated and displayed during this mode
- (PV) Minimum Voltage Mode: updated and displayed during this mode

Current values of less than 0.05A are not measured and will display as 0.00A

It is important that you not have anything connected to the USB Power Meter until after the power meter has been connected to the host and a reading of 0.00A is observed. Then you may connect the device to the power meter.

When switching to a different mode, there is a 3 second delay for the reading to display. It is possible to quickly click to reach a mode other than clicking and waiting at each mode to get to the mode you want. For instance, if I am in A mode and want to quickly check Minimum Voltage, I can quickly click three times and I will be at the PV mode.

I find this to be quick and as far as I know, accurate. It's very helpful for diagnosing bad cables, faulty USB ports and discovering what the voltage and current is across USB connections.

This has proven to be a durable, well-made power meter.Read more ›
Comment 25 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsSimple, easy to use tool for measuring USB voltage and current to devices
By L. Finch on October 3, 2013
Verified Purchase
So why would you need this? I got it to determine how much actual power was used by my Kindles, iPad and iPhone during charging, but I then discovered other uses, such as measuring the power consumption of my Arduino projects. It works as advertised; plug it in, plug the load into it, and it can display instantaneous and peak voltage and current being drawn from the power source. A single button toggles between the display modes.

The name is slightly misleading; it does not measure power; it measures voltage and current. The user must multiply these to determine power, if power is desired. A minor nit, however
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5.0 out of 5 starsVery accurate meter, passes through data (USB3 SuperSpeed and lower)
By C. Thorp on November 28, 2013
Verified Purchase
This is the best USB power meter I have ever used. I checked the calibration against my in-cal Fluke 87V and it is very accurate on both volts and amps. The design is great because it passes the data lines through so that it can be used on any USB device. Unexpectedly, it even passes through USB3 SuperSpeed!
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4.0 out of 5 starsWorks well once you learn the trick
By Ken on March 13, 2014
Verified Purchase
I received this USB Power Meter two days ago. My first reaction was the voltage meter worked correctly but the current meter did not provide correct values and mostly stayed on 0.00Amps.

I played with it some more and after a little experimentation found that you must plug the USB Power Meter into the power source before you plug any USB devices into the power meter or the current measurements are all incorrect. This is the trick to making this device work correctly.

The instructions that came with the USB Power Meter do not mention that you need to power up the USB Power Meter before connecting the load. I am assuming the most of the low reviews come from user that did not discover this.

I have been using this to monitor charging of an Estes Proto X quad copter battery from a Morphie USB battery. It does the job well.

I also tried it connected to an IPhone charger and an IPhone, and a computer and a few different USB devices. Worked well.

I did not check the calibration of the unit I received but I may do that in a few days and update my review. All of the numbers displayed seemed reasonable. The manual says +/- 1% for voltage and +/-2% for current.

The maximum current specified in the manual is 2.0Amps. This should be fine for most USB devices. I will point out the latest IPad chargers are 12 Watts (2.4Amps) so this is not the type of device you should be playing with if you do not know a little about electronics. It is not likely that you would damage the power source or the test device but you could damage the meter.Read more ›
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Most Recent Customer Reviews

5.0 out of 5 starsFive Stars

like it

Published 7 months ago by Dwayne Fee
5.0 out of 5 starsVery handy!

Very handy. Useful too. The LCD display is a bit hard to read except in good light.

Published 7 months ago by Tracy S. Dryden
5.0 out of 5 starsRequired if you want to know which cables and chargers are fastest

How did I live without this? I tested a number of cables and chargers and found BIG differences. By mixing and matching I now have the wall charger and cable combinations that... Read more

Published 9 months ago by Mockingbird
4.0 out of 5 starsFailed in one case, works fine otherwise. Reasonably accurate.

When I first used this meter with the high-current devices I wanted to test, it would blank as soon as I plugged them in, which made it kind of useless for what I wanted it for. Read more

Published 11 months ago by Kevin Reid
4.0 out of 5 starsFour Stars

good item

Published 13 months ago by FAWAZ ALQAHTANI
4.0 out of 5 starsit works fine

As far as I can tell this does exactly what it's supposed to.

Published 13 months ago by Jake
5.0 out of 5 starsFive Stars

It works!

Published 15 months ago by Amazonian
5.0 out of 5 starsGreat tool for USB powered devices. No more guessing.

Great to see if any the USB power supply are delivering the right amount of amp & voltage. It will tell how much current are pass through.

Published 15 months ago by VL from LA
5.0 out of 5 starsExcellent unit

Professional quality product, accurate, easy to use. This is a solid USB meter.

Published 15 months ago by dale1031
2.0 out of 5 starsCareful - mine failed when it was attached to a ...

Careful - mine failed when it was attached to a power supply for my Dell Venue Pro tablet, which apparently has more than just 5v on the USB cable. Read more

Published 16 months ago by Amazon Customer

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