Can you use this to test if you need a charge port or charge ic replacement on your device?

If I understand your question correctly, you're asking if this can check whether something isn't charging because of the port you're plugging into being faulty or whether the device itself is not taking charge. Then, the answer is probably, yes. I personally use it to check "unknown" USB ports before plugging in my expensive equipment. Plug the tester itself into the port and check that the voltage is reported as between 5.0 and 5.15V with no load. Then plug in a "known good" device to the other end of the tester and check that the voltage remains good (above 4.9V) and the current drawn is "about right" for the device plugged in (can be very variable). If this all seems good then plug in your "suspect" device and check again what happens to the output voltage and current drawn.

Does this device support USB 3.0 for faster data transmission?

It definitely does not support USB 3.0. I was very disappointed when I realised as I’d not have paid as much as I did.

Can I measure energy consumption on my laptop while running applications as Energy from this tester?

This device will only tell you the out put voltage of the usb socket it’s plugged into. The power consumption is only displayed when you plug a usb peripheral into the pass through usb socket but then will not show the power consumption of your laptop but only power consumption that’s plugged in the the pass through usb socket of this device. You must have some kind of software app on your pc/ mac to show you the power your computer used while running. Hope this helps

Does a hard drive plugged in to this connect to the pc? i have another of these volt/amp meters, but connected hard drives aren't be seen by the pc

Just tried mine on this USB 3 hard drive enclosure: https://www.amazon.co.uk/Sabrent-External-Lay-Flat-Docking-Station/dp/B00LS5NFQ2/ref=sr_1_12?crid=2MD6XPK2QB5GN&dchild=1&keywords=sabrent&qid=1598605732&sprefix=sabrent%2Caps%2C148&sr=8-12 fitted with a 3.5 inch 2tB SATA hard drive and it does seem to work OK. The drive shows up in Explorer and I can read and write to the drive. Seems a little slow though - maybe only running at USB 2 speed. Also bear in mind that the USB hard drive is externally powered with its own 12V mains adapter. Hope that helps.

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⚡ Power up smarter, not harder!

SAFETY FIRST DESIGN - Built-in electronic switch cuts off output to protect your devices from overloads up to 30V/5.1A.
DATA DRIVEN CONFIDENCE - Stores charging data even on sudden power loss, empowering you with reliable, actionable insights.
FAST CHARGE COMPATIBLE - Supports QC 2.0/3.0 protocols and accelerates large current fast charging for next-level efficiency.
CUSTOMIZABLE CALIBRATION - Six adjustable settings let you fine-tune amp, voltage, and protection thresholds for tailored performance.
PRECISION POWER INSIGHTS - Monitor voltage, current, and power with a crisp 0.96” LCD for real-time charging optimization.

The COOWOO USB Tester is a sleek, multifunctional digital power meter designed for professionals who demand precision. It measures voltage, current (up to 5.1A), capacity, and power with real-time display on a 0.96” LCD. Featuring advanced safety cutoffs and compatibility with QC fast charging standards, it ensures optimal and secure charging for all your USB devices. Compact and customizable, it’s the ultimate tool for monitoring and optimizing your tech’s power performance.

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Manufacturer	COOWOO
Part Number	SIYECAO
Product Dimensions	0.65 x 0.14 x 0.24 cm; 30 g
Manufacturer reference	SIYECAO
Colour	black
Style	Modern
Power Source	DC
Voltage	30 Volts
Wattage	150 watts
Item Package Quantity	1
Certification	energy
Special Features	USB capacity detector, usb digital multimeter, usb security monitor usb security tester, usb tester meter charger tester., usb voltage meter usb amp meter
Batteries included?	No
Batteries Required?	No
Item Weight	30 g

COOWOO USB Tester Digital Power Meter Tester Multimeter Current and Voltage Monitor, DC 5.1A 30V Amp Voltage Power Meter, Testing Speed of Chargers, Cables, Capacity of Power Banks

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