YOJOCK USB Tester Multimeter Digital 4-30V 0-6.5A, QC 3.0 Power Meter Voltage and Current Tester Detector, Volmeter Ammeter Power Bank Capacity Tester with IPS Color Display

This works great and it's pretty accurate when it comes to current draw. It's a nice quick check to see what USB devices are drawing. Also checks to see that USB power sources are at the correct voltage level and don't drop excessively when something is connected to it. It's great because you put it in line and anything you plug in it immediately shows you real time voltage and current. You can also freeze it and save it.

Needs to come with a "complementary" magnifying glass! :D

I just wanted a usb tester to check how much some devices draw when charging, and this little donk fits the bill nicely. Pretty clean and easy to read display, seems accurate, and, well, it works! What more can you ask for? Nice case to protect the display is also included, so it's convenient to toss in with my cables, etc. so I always have it available. Happy.

This little device is so cool. It allows you to finally see how much current your charger is putting out. But the fun doesn't stop there. It also allows you get an idea of how much capacity the battery actually has.My only complaint is that the display is too small and doesn't present itself as easy to see in my charger. There is really no explanation of the what the button does but I learned that if you push the button twice quickly it changes to the alternate display and 9 slot memory function. quickly pressing the button twice again goes back to the generic display. If you hold down the button it clears out saved data.

Works Great with 18650 battery BMS and charger.Shows Current and Voltage as well as the watts and milliamp-hour input.

Does what it's advertised to do.

Pros: gives a reading of voltage produced by your power brick, power adapter or whatever usb power port you are using so you can assess if it is “safe” to plug in your device. It also gives you a reading of amperage, which tells you how much current your device is drawing (and get to know, for example, if your device is fast-charging). It is also handy if you want it for a more “professional” usage and see if a device is at least drawing power.Cons: it has a USB-A plug and no adapter for USB-C, so, if you need it for testing a USB-C port, you will need to find a USB-A to USB-C adapter.Overall, great little device which gives you important information that can actually save you from plugging your phone, tablet or laptop to an unsafe usb port. (Beware, unsafe electrically, this device does nothing in terms of information security, it’s not meant for that).

Super easy to read, seems accurate. Way better than the previous device I was using.

LED text window is pretty small, but works exactly as expected

The media could not be loaded. Das USB Tester Messgerät ist ein erstklassiges Werkzeug, das ich jedem empfehlen kann, der regelmäßig Strom- und Spannungsmessungen an USB-Geräten durchführt. Das Gerät kommt in einem robusten Case, das es vor Stößen und Kratzern schützt, was besonders praktisch für den mobilen Einsatz ist. Die Messungen sind decken einen großen Spannungs- und Strombereich von 4 bis 30V sowie bis zu 6,5A ab, was es vielseitig einsetzbar macht, egal ob man Smartphones, Powerbanks oder andere USB-Geräte überprüfen möchte.Ein besonders nützliches Feature ist die Speicherung der mAh-Werte – selbst nach einer Unterbrechung der Stromzufuhr bleiben die Daten langfristig erhalten. Das ist ideal, wenn man über längere Zeiträume Messungen durchführt oder den Test zwischendurch pausieren muss. Der integrierte Reset-Button ermöglicht zudem ein schnelles Zurücksetzen der Werte, um mit einer neuen Messung zu starten.Das Gerät unterstützt moderne Schnellladestandards wie PD und QC, was es besonders für aktuelle Geräte attraktiv macht. Die Benutzeroberfläche ist übersichtlich gestaltet, sodass auch technisch weniger versierte Anwender problemlos damit arbeiten können. Insgesamt macht das Gerät einen soliden Eindruck und erhält eine klare Empfehlung. Das Preis-Leistungs-Verhältnis ist exzellent, und ich bin rundum zufrieden mit dieser Anschaffung!

Works perfectly straight out of the box, i use it to see what current is being drawn from my repairs. It works with a multitude of adapters. Crystal clear picture on the screen and very informative. For the price paid, this is an absolute gem of a device. Must have for any repair enthusiast!

Cumple bien su mision

Fourni dans un boîtier plastique avec feuillet de mode d'emploi anglais / chinois.Malheureusement pas de film de protection sur l'écran, qui présente quelques griffures ; elles ne gênent pas la lecture, mais pour un matériel neuf ce n'est pas normal, d'où étoile en moins.Pas d'idée de l'exactitude des indications, mais au moins on peut comparer les courants de charge d'un appareil par différents chargeurs.Comme indiqué dans d'autres commentaires, dommage que l'affichage ne soit pas réversible.