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All-round Protection for Safety Use
Voltage and Current Protection Function:
Over Voltage Protection Function: The system default value of Over-voltage Warning is 32.0V.
To change Over voltage default value, please select the 1st option (>32.0V OVP) on system setting interface; short press the key to decrease 0.1V; quick 2 press the key to increase 0.1V.
Low Voltage Protection Function: The system default value of Low-voltage Warning is 0.00V.
To change Low voltage default value, please select the 2nd option (<0.00V LVP) on system setting interface; short press the key to decrease 0.1V; quick 2 press the key to increase 0.1V.
Over Current Protection Function: The system default value of Over-current Warning is 8.00A.
To change Over current default value, please select the 3rd option (>8.00A OCP) on system setting interface; short press the key to decrease 0.1A; quick 2 press the key to increase 0.1A.
Tips:
1. When this USB tester connect to USB-C device and USB-A to USB-C cable, you should insert the OTG adapter (Micro USB adapter) into USB tester to trigger the PD charging function. Then the USB tester can be used normally.
2. If there is current in the tester without connecting load, press and hold the key of USB tester, then connect to device and calibrate to zero. During calibration, the output must not have any current consumption.
Important: Please download more information from Product guides and documents.
The product is constantly updated and new content is added, so sometimes the version you receive may be different from the description, but it does not affect the quality and use of product.
Operation Instructions of USB Power Meter
- Short Press to switch different interface
- Quick 2 Press: Reset capacity (mAh)
- Quick 3 Press: Reset energy(Wh)
- Quick 4 Press: Reset timing (00:00:00)
- Quick 5 Press: Change group number (NO.X, total 10 groups of data)
- Long Press to reset capacity, energy and timing of curent group(mAh, Wh, 00:00:00)
- On the system interface, short press the key to switch different setting options, long press the key to select and enter the option.
Features
Become A Safety Guard of Your Devices
Detect Charging & Discharging condition of your devices.
Wide range of application, can be applied to test Type-C and Micro USB devices.
Under the circumstance of the constant power supply and sustained load, the larger voltage and the lower voltage drop of the USB cable detected by this USB tester means that the better quality of the USB cables will be.
Test the Output Current of the Charger
USB tester provides real-time charging parameter information of charging status to you, ensure a safety charging environment to your devices.
Note: If the USB tester doesn’t display any parameters, please insert the USB Micro adapter into the side hole on the USB tester to trigger the PD charging function.
Test Capacity and Electric Energy of Power Bank
Make sure the power bank to be tested is fully charged firstly, then connect to this USB tester and reset the capacity and electric energy by long pressing, and then fully discharge with this USB tester and 5v load till power bank run out of its energy. The reading on this USB tester is real data of capacity of your power bank.
Test Various USB A/C Chargers
Plug the USB tester into the charger and connect an adjustable current load;
Perform current adjustment and test the current and voltage data of the charger;
Let the charger be connected to the current loader for a long time to check the stability of the charger.
2-IN-1 Tester Meter
Our USB tester can meet the transform of two kinds of output. When USB-A input connect to your charger, the USB-A output and Type-C output both support testing electricity.
Note: the Micro USB Adapter should be inserted at this time.
Laptop Charge Monitor
When charging the notebook, connect a YOJOCK USB meter to monitor real-time voltage, current, capacity, power, temperature and other electric parameter information.
Jan De Bruyne
Reviewed in Belgium on February 27, 2025
Doet wat weloofd wordt.
Lightofgrace
Reviewed in the United States on January 12, 2025
This connector helps for multiple inputs and output types., displays a lot of details, Direction, Voltage, Amps and much more. A great device to have.
Paul - Spokane
Reviewed in the United States on August 22, 2024
I needed to watch a few YouTubes to understand how to test. Instructions were better than some had posted (maybe they updated) but still not completely clear. Got a few bad readings when I didn’t unplug and replug in cords/plugs in between test, so be careful. Overall love the device and my apologies to the cord company I thought sent me a bad cord ☺️
MusicoMan
Reviewed in the United States on August 11, 2024
I was using this on the day it arrived, and I used it in parallel with another brand that does mostly the same thing except -- this has more connections! I found it to be accurate in the tests I was running as it was in agreement with a multimeter and the other unit in use.The added connectors create convenience, and mine came in a little plastic box that is a great place to keep it safe with my other test tools when I'm on the go.I like the flexibility, the ergonomics are excellent, readability very high, and the connectors are, while not rugged, solid as expected. I will probably buy more of these, but for now I'm quite happy with the one in hand.
BigDaddyNC
Reviewed in the United States on July 3, 2024
One can never quite tell what any given USB port is going to be able to charge or even how fast. This device allows me to see both USB A and USB C connections and the voltage, amperage, and wattage used when a device is plugged in. I also have some multi-device charging stations and I know that they need a certain amount of power in order to charge the phone/earbuds/watch combinations. Your garden variety USB A port usually only puts out 5V...even at 3A it's not quite enough.Here's a bit of trivia...I plug my tablet into a USB C port on one of my hubs and this device tells me that it is charging at 15V and a little more than 1A. I plug the same tablet into one of the same hub's USB A ports and it charges at 5V and 2A. Now that I have seen what the ports can put out, I know more about the fastest way to charge the tablet in question.Bottom line, if you have a bunch of chargers and a bunch of cables and you want to see what their capabilities are, get this product. Do it.
hurdler-boiling.04
Reviewed in Canada on July 25, 2024
Works well and answers the question "why is my device charging so slowly". This clearly shows the voltage, current and watts to help identify problem with cables and chargers. I am happy to have made this purchase.
Thomas Unger
Reviewed in the United States on June 17, 2024
OK, I assume that it is giving me correct values, and that is good. However, I find the display very difficult to read. Especially those numbers shown in red.I’m using this to measure output from a solar panel. As a result, I’m often reading the display in sunlight. If your use case is in a dimly lit room I’m sure the display will be readable.There is only one button that controls everything. I think they did pretty good with a one button interface. There are a few more screens to step thought than I would like, but, OK.
Mr68K
Reviewed in the United States on February 9, 2024
This is a super value! I wanted something that had USB C and A connectors and this guy has them all plus Micro.It is really cool, and show you very quickly and without fuss how much voltage is going in and how much power was consumed. I was able to find out very quickly that the battery jump starter did not charge at 9, 12 or 20v and what a simple 5v USB-C design. It only took 6,500 mAhrs @ 5v and took 4 hours.Considering the price and ease of use, I will have to give this little guy 5 stars! I'm sure there are more advanced, but considering the price, this rocks.
Customer
Reviewed in the United States on November 6, 2024
Amazing little device that does exactly what is supposed to do. Affordable and reliable. Already tested it with multiple devices and seems to give accurate readings every time. Amazing little device to have on your electronic stuff drawer.
Appie Kouwenberg
Reviewed in the Netherlands on November 13, 2024
Hiermee is goed af te lezen of de adapter en/of de aangesloten kabel goed functioneren.
tasmanix
Reviewed in France on November 10, 2024
Est plus utile que je ne le pensais au départ. Permet de connaître le besoin en milliampère de tout appareil qu'on veut brancher sur une prise USB, ce qui permet d'éviter de brancher un appareil dont la consommation dépasse la capacité de la prise USB, ce qui évite des conséquences qui peuvent être désastreuses, certaines prises USB étant très limitée de ce point de vue. Cela permet de savoir aussi si un appareil fonctionne.
Usuario
Reviewed in Spain on October 8, 2024
El producto funciona correctamente y tiene diferentes ventanas donde ver más o menos información, me parece bastante claro al mirar. Lo he probado con un cargador de hasta 20W cargando un MAC.Tiene entrada USB normal y USB-C, para las cosas viejas y nuevas.Como aspecto negativo, es que se apaga su pantalla si no hay nada conectado y no se vuelve a encender aunque conectes una carga. Me hubiera gustado que se quedara encendido siempre.
Anastasia
Reviewed in the United States on December 14, 2023
This was delivered on time. I misunderstood a few things in my testing and the manufacturer was quick to respond to my questions. I believe that I tested every J7-c configuration. While I cannot vouch for the accuracy - it did what I needed - I can state that everything worked. There are some limitations in the device, but more on that below. Most of the limitations seem to be due to destination plug standards.USB to J7-c to USB to lightningInput - I tested this with both a powerpack and plugged into the wall chargerOutput - to a magnetic charger for an Apple WatchResult - perfectUSB to J7-c to Type-C to lightningInput - I tested this with both a powerpack and plugged into the wall chargerOutput - to a iPadResult - perfectType-C to J7-c to USB to Apple magnetic chargerInput - I tested this plugged into the wall chargerOutput - to a magnetic charger for an Apple WatchResult - no output, however, the manufacturer told me of this limitation:"Apple devices don't support charging like this because Apple’s charging system is strict, it with a charging identification chip. If you use this usb tester to test Apple devices, it only supports Type C-Type C-lightning or USB-USB-lightning or USB-Type C-lightning."Type-C to J7-c to USB to miniInput - I tested this plugged into the wall chargerOutput - to a GarminResult - same as last test, probably due to same "standards" limitationType-C to J7-c to USB to microInput - I tested this plugged into the wall chargerOutput - to a powerpackResult - same as last test, probably due to same "standards" limitationType-C to J7-c to Type-CInput - I tested this plugged into the wall chargerOutput - to a iPadResult - perfectMicroUSB to J7-c to USB to USB micro to a powerpackInput - I tested this plugged into the wall chargerOutput - to a powerpackResults - SuccessMicroUSB to J7-c to USB to Type-C to a magnetic charger for an Apple WatchInput - I tested this plugged into the wall chargerOutput - to a magnetic charger for an Apple WatchResults - SuccessMicroUSB to J7-c to USB to USB mini to a GarminInput - I tested this plugged into the wall chargerOutput - to a GarminResults - SuccessMicroUSB to J7-c to USB to USB mini to a magnetic charger for an Apple WatchInput - I tested this plugged into the wall chargerOutput - to a GarminResults - J7-c showed input power level, but no output power createdIn summary,a) the J7-c with USB input worked great for all output types I testedb) the J7-c with Type-C input worked fine when the output was Type-Cc) the J7-c with MicroUSB inputd) J7-c use with Apple Lightning can be problematicThis fits my needs now that I know the limitations and I recommend this to other users.
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