|Product Dimensions||0.7 x 0.2 x 0.2 cm; 30 Grams|
|Is Discontinued By Manufacturer||No|
|Item Package Quantity||1|
|Usage||Usb tester meter charger tester., usb security monitor usb security tester, usb voltage meter usb amp meter, USB capacity detector, usb digital multimeter|
|Item Weight||30 g|
COOWOO USB Digital Power Meter Tester Multimeter Current and Voltage Monitor, DC 5.1A 30V Amp Voltage Power Meter, Test Speed of Chargers, Cables, Capacity of Power Banks-Black
- Multifunction:COOWOO smart digital USB meter can be used to test voltage, ampere, capacity, electric energy, power, recording charging time etc. With 0.96" LCD display, making it easy to monitor the charge voltage and current of your digital USB devices, while ensuring the optimal charge rate. Simultaneously displaying of Amp and Voltage in real-time.
- Safety Guard: Built in protective electronic switch element for detecting safety, it will cut off output automatically and protect your appliance from damaging; it will store data when power off suddenly. Voltage can't exceed 30V, current can't exceed 5.1A.
- Testing Function: USB Port is dedicated for both Data Sync and Battery Charging purpose, which has built-in circuit with containing CW3002D chip for accelerating Large Current Fast Charging. Compatible with QC 2.0/3.0 high voltage test; Testing capacity and electric energy of mobile power bank; Testing the maximum output current of the charger; Testing charging speed and quality of data cable and charging cable.
- Six Setting Interfaces: ampere calibration, voltage calibration, high voltage protection threshold, low voltage protection threshold, over current protection threshold and capacity compensation coefficient; press the key cyclically to review them.
- Satisfaction Guarantee: 100% risk-free satisfaction guarantee. We offer you 100% hassle-free satisfaction guarantee to let you buy with confidence. For any reason you are unsatisfied with our product at any time, just feel free contact support for exchange or refund. Our customer service team are here and ready to assist you with any questions or concerns you may have before or after the purchase.
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Input/Output Voltage: DC3-30V
Input/Output Current: 0-5.1A
Current Resolution: 0.001A
Capacity Range: 0-99999mAh
Capacity Resolution: 0.001Ah
Electric Energy Range: 0-999999mWh
Electric Energy: 0.001Wh
Power Range: 0-299.999W
Power Resolution: 0.001W
Resistance Measuring Range: 1-999.99Ω
Resistance Resolution: 0.01Ω
Measuring Speed: 0.5/s
Line Loss: 0.1Ω
Battery Capacity: 0-999.99Ah
Working Time Display Window: 0-24h
Self Current Consumption: less than 0.02A
Working Temperature: -10 ~ +60 ℃
Working Humidity: 10 ~ 80
Dimension: 2.63*0.94*0.55 inches
Weight: 0.13 lb
Package Includes: 1 X USB Multifunctional Tester
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Seems to be accurate within 0.1-0.2 amps and within 0.05-0.1 volts.
Reversible USB-A male port so you can flip the device either way in order to see the display.
The included tiny manual is HORRIBLE. This is one of the worst "Engrish" written texts I've ever seen.
No way to confirm if your charger does in fact support charging its maximum advertised wattage unless you have a USB device that supports the same power rating (see below for details).
When I first plugged in the tester to a charger, I didn't realize you also had to connect a USB device (i.e. phone, tablet, etc.) into the female USB port in order to get an amperage reading (something that wasn't mentioned in the horrible manual). If you just plug the tester into the charger, it will only show the voltage (i.e. 5V) with 0 amps. Once you connect your phone, tablet, etc, it will show you how many amps the device is drawing. So for example my iPad Air (1st Gen) is apparently only rated to pull 2.0A for charging, so when connected to my 2.4A charger it only showed 2.0A on the tester. My wife's iPad Pro 9.7" might support higher amps, but it's currently fully charged so I'd have to wait for it to go down at least below 80% before it will recharge at full amperage.
At any rate, I was able to get a general idea of how well my chargers were performing (inlcuding a no-name Chinese brand charger rack I bought from Amazon) and all appear to be performing well. I just wish there was a method to test the charger itself for its maximum amperage.
Unfortunately it doesn't let you do any kind of quick-charge tests/verifications, but it will let you know USB D+ and D- line voltages which you can cross-check with USB specs online if you're interested
There are lots of reviews on youtube with features overview, make sure to check them out too - the included manual is really confusing at first but in reality this meter is super simple to use
Can definitely recommend
Not all chargers are fast and not all cables are fast. Over time you will accumulate dozens of cables and some of them will be pretty awful for use in power transfer.
This device will tell you how much power is flowing so you can bin the useless cables and dead chargers.
Plug it into the USB port of the charger and then plug the cable into this device to see the power levels in real-time.
* unless you have background addicted chewing a bit more power etc.
Reversible/2 way usb is a really nice feature.
One star off as the display is hard to read in bright conditions. This may not matter for your usage but since I bought it for monitoring portable solar it effects me.
Would give 4.5 if I could.
For the couple of USB-3 drives I tested, it didn't seem to be passing through the USB-3 handshake(s), so only USB-2 operation...