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PortaPow USB Power Monitor/Multimeter/DC Ammeter for Solar Panels, Mains Chargers, PC

4.6 out of 5 stars 58 customer reviews

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  • Plugs into any USB socket, shows the power (current and voltage) going from the socket to the device you're charging from it in real time.
  • 0-3000mA (3A), 0-10V, Accurate to 0.01A, 0.01V. Uses <4mA (20mW) of power for the most accurate readout.
  • Uses a switch to change the display between current and voltage. No need to wait 10 seconds for the display to change as with alternative products.
  • 3 inch extension cable means you can turn the screen to face you regardless of how the USB socket is oriented
  • LCD Display is easy to read indoors and in bright sunlight, unlike LED displays
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Product information

Technical Details
BrandPortaPow
Item Weight41 g
Package Dimensions8 x 5.5 x 4 cm
Item model number0766897525919
SeriesStandard
  
Additional Information
ASINB00DF2485S
Best Sellers Rank 47,989 in Computers & Accessories (See top 100)
Shipping Weight41 g
Date First Available17 Jun. 2013
  
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Product description

Product Description

This multi-meter plugs directly into any USB socket and allows you to connect any USB cable into it for charging or data transfer. It displays on screen the voltage and current which is being output, acting as both a volt and amp meter. It is powered inline so no battery is needed, and uses low resistance components with <4mA power consumption for the most accurate readout.

A 3 inch extension flexible cable means you can turn the LCD screen to face you - it won't be fixed facing the floor/wall regardless of how the USB socket is oriented. It uses a large LCD display is easily visible both indoors and in bright sunlight, and uses a switch to let you choose between displaying current and voltage.

The meter is useful for solar panels with USB outputs, since it will then allow you to position the panel to maximize the energy it outputs, see what factors affect the panel's performance, and also to see when the output is too low to be worth using the solar panel.

It is also allows you to compare the power of different USB sockets and study the quirks of USB charging. It has an upper limit of 3A.

Box Contains

Power Monitor
User Guide


Customer Questions & Answers

Customer Reviews

4.6 out of 5 stars
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Top Customer Reviews

Verified Purchase
With this device you can investigate how mich power various items take and whether you need to get a better charger or a better cable. It really does show how all chargers and cables are not eqyual and many new devices such as Nexus 7 cannot be kept charged up properly without the right equipment.
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Verified Purchase
Used it to measure various mobile/tablet chargers and cables I had. Worked seamlessly. Haven't found any alternatives on the market. Switch shows Volts or Amps. Measured voltage drop between charging cables of various lengths.
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By Jim on 28 Sept. 2013
Verified Purchase
This works well with my goal zero solar panel. It lets you know if there is enough sun to actually put a charge into your phone ETC.
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Verified Purchase
I got 4 of these so I could test different configurations with multi-port chargers and to check out the solar panels and fast-charge cables I got from PortaPow. Useful for that.
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Verified Purchase
I ll start by saying that at the moment Portapow is the only supplier of a USB tester.

It is excellent!!! I use it with my portable solar panel and it helps me to adjust it at the right angle so that I can get maximum efficiency. I have also used it to check the output of portable back up battery packs such as TeckNet/Mili/EasyAcc. It works perfect in any occasion. So if you want to test any USB output your answer is Portapow tester. I have found two small negative things: one is the stiffness of the female USB extension cable(personally I would have liked a bit more flexible), and second the overall quality of the housing plastic of the unit which I believe has some space for improvement.
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Verified Purchase
Bought this to show me how much juice was being used by my phones/ipad and compare/test chargers/cables - the basic theory is the higher the current drawn [for a given config], the better [as it will be charging the battery faster]

This unit shows voltage or current [easily switchable on front] to hundredths e.g. 0.69. Claims 0-3A but the highest I measured was 2.4A by iPad Air [USB voltage should always be near 5V]
Body of this unit is 7cm long with the cable [not including the USB plug] also being 7cm, display text height 1cm & weight 44g - unit does not take a battery and doesn't have a backlight

Tested with a Nexus 4 and iPad Air, using an iPad Air wall-wart charger [i.e. high current out] or a 1A wall-wart or a USB port on a Windows computer, along with several cables - Nokia micro USB, a cheapo extendable micro USB etc]

Watching current drawn vary when changing things e.g. switching screen on/off, was interesting :-)

The 'normal' micro USB cables [i.e. have data and power] all seemed to perform similarly -
iPad wall-wart: the Nexus 4 drew 0.82A when its screen off and 1.02A when on [figures jumped around a little]. The 'power only' cable was very similar [maybe slightly higher].
1A wall-wart: the Nexus 4 drew figures which spiked alot more [up to 1.35A with 'power only' and 1.25A with 'power and data'] though usually about 1.05A.
USB port on computer: the 'normal' USB cables all dropped to 0.45A but the 'power only' to 0.76A

For iPad [apple lightening connector], got 0.46A connecting to computer and 2.34A when connected to the iPad charger [same with screen on or off]. Also tried from iPad wall-wart using the 'power only' Micro USB cable with the official apple micro usb to lightning converter and got 0.
Read more ›
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Verified Purchase
Lovely gadget I bought to monitor my portable solar panels.
And I love it. I don't know how much it's accurate but I have no doubts it works properly for my needs.
I paln also to buy the bigger brother.

Thank you Amazon!
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Verified Purchase
Does what it says on the tin, and has already revealed to me that longer charging cables can significantly reduced charge rates into an iPad (which draws 2A if it is allowed to). I'm just a bit concerned about build quality - the USB output socket protrudes from the casing, and in my case it wobbles slightly and is not quite parallel to the body of the meter. Still, I don't expect to use it a lot - just to test new/unknown charging gadgets, really - so I don't expect this to be an issue.
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