[Aleksejs Mirnijs] needed a tool to accurately measure the power consumption of his Raspberry Pi and Arduino projects, which is an important parameter for dimensioning adequate power supplies and battery packs. Since most SBC projects require a USB hub anyway, he designed a smart, WiFi-enabled 4-port USB hub that is also a power meter – his entry for this year’s Hackaday Prize.

Smart USB/4 port hub/Power meter with LCD
Need power up your’s USB devices and monitor consumption? Yes!
https://hackaday.io/project/11178-smart-usb4-port-hubpower-meter-with-lcd

6 port USB power meter with 2.2″ LCD display will monitor every USB port and show real time used current (A) and power (W) maesuring up to 3AMPS and batterys charging (mAh).

With added 4xUSB 2.0 hub to it you can use it with your’s Raspberry Pi or PC for connecting external USB flash or HDD, Wi-Fi or Bluetooth dongles and others devices, like USB port extension and USB PSU/charger. It will help you to project any USB device and control it’s consumption.

The USB Charger Doctor is a small device that goes in series with your usb cable to measure the devices voltage and current consumption. It can be purchased for around $3 overseas on eBay or $4-5 on eBay from a retailer that has already imported the unit.

A USB multimeter with integrated OLED display designed to accelerate your smartphone or tablet’s charge speed up to 92% faster.

The Legion Meter is their latest gadget to hit Kickstarter, and it has already smashed all the company’s previous records for success.

The Legion Meter features USB connectivity and a built-in OLED display to provide instantaneous information. Since this device is a miniature multimeter, users can view the current delivery of watts, volts, amps, and milliwatt-hours. Not all cables, USB ports, and wall adapters are created equally. Although a product may list an input of 5V/1A, it rarely (if ever) draws that maximum amount. The Legion Meter helps you separate the wheat from the chaff.

On top of that, the Legion Meter has a charge accelerator, which is good for Apple and Android devices. Selecting this mode allows the USB port to safely draw the maximum amount of power.

http://www.amazon.com/AboveTEK-Charging-Monitor–Multimeter-showing/dp/B00HTAH3KY/ie=UTF8?m=A37ZOD60SUJEE6&keywords=usb+power+meter

Same function and feature but less than 10 bucks!

The brilliant thing about the Age of Almost-Universal USB Power (AAUUP) is you can get power from almost anywhere: a laptop, a wall plug, a portable battery backup, your car, maybe your bike—anywhere there’s a little rectangular slot and a cable.

The tough thing about the AAUUP is that you are not aware of just exactly how much power is passing through to your phone or other device. Would you be better off charging through your laptop, right in front of you, or is it worth plugging directly into an AC plug?

Power nerds (and I am certainly one of them), take heart: the Practical Meter has arrived, fresh off a successful Kickstarter campaign (“successful” as in 16 times their goal). It works, and it will surprise you with just how different your myriad charging options can be.

Why isn’t one USB just like another? The short version is that different device makers stick to different standards, and that gadgets sometimes ship with the cheapest cord or wall charger that will work for that particular device.