Klein Tools ET900 USB Power Meter, USB-A Digital Meter for Voltage, Current, Capacity, Energy Resistance

This USB power meter is very versatile, allowing me to test voltage and current in USB connections. It can measure voltage from 3 to 20V DC and current from 0.05 to 3A (USB-A) or 0.05 to 5A (USB-C). This wide range covers most standard USB ports, including Qualcomm Quick Charge ports. With it, I can measure and display important information such as USB port voltage, current, capacity, energy, and resistance, providing valuable insight into my USB power usage on various devices. My only minor gripe is that the meter instantly shuts off after a low current draw or power cycle, rather than retaining the data. It would be more convenient if it saved the last reading for a short period. It's important to note that USB Type-C connections operate with efficiency and safety in mind, meaning that the charger will only supply power when it detects a device connected to the other end. If no device is connected, the power meter will not power up as it doesn't receive any power from the charger. This feature prevents unnecessary power wastage and reduces potential electrical hazards. --- Product: Klein Tools ET920 USB Power Meter, USB-A and USB-C Digital Meter for Voltage, Current, Capacity, Energy and Resistance ASIN: B07GXZHPVR

One of the better USB testers on the market

Works well and useful for testing all mobile devices and charging sockets/cables. Happy with this unit, but I do use lots of mobile devices and recharge gear, and testing optimum recharging solutions is important to me. Not for everyone.

it works. and it really helps see issues.

Absolutely terrific, was able to measure a couple of USB-C wall chargers that were not rated as specified! Saved me a ton of $$s already. Thank you to the other reviewers who pointed out that the USB-C needs to have load on it prior to connecting the input to the power providing charger. USB-A is automatic. In any case, works well. The only thing I would ask is if it can also provide Watts on the display! (it does provide mAH and wH, for watts, have to just multiply Volts x Amps). A bit expensive, but well worth the ease of use. Highly recommend.

What's different about this one (the USB-A Tester and Meter), is that it has the tester built in. I haven't really come across any USB power meters that have that feature. Either that or I have, and they were just too complex for me to realize that they did. What I would really like to see though, is something that's just like the power meter that has a USB-A and a USB-C output and input, and that also has a tester like this one does. As far as basic testing of what devices are charging at though, this tester and power meter works quite well, in my opinion.

the Klein Tools ET920 USB Power Meter, USB-C and USB-A Digital Meter for Voltage, Current, watts, resistance all work great, just plug it in look at the screen, very easy to use. the graphics are not great but work with no problems, so many review say the USB-C does not work, the USB-C will not work on apple dc power USB-C device do to apple non standard USB-C dc power wiring the klein meter will not work, also the meter has usb input and output that must be correct or meter will not work properly. USB-C works fine with the standard USB-C DC Power wiring. Film and TV Engineering for 25 years.

Helped diagnose a problem with a Wi-Fi hotspot. Turns out, it expected 12V, instead of the normal 5V.

Amazon perfetta come sempre: comprato un oggetto, risultato non funzionate, me lo hanno sostituito e visto che nemmeno il secondo funzionava, me lo hanno rimborsato. Prima di rendere il secondo oggetto, però, ho contattato la casa produttrice sperando in un loro supporto e sono qui a raccontarvi la mia esperienza. I due dispositivi che ho provato, visualizzavano la tensione ma non la CORRENTE, parametro fondamentale per un simile tester. Ho scritto alla Klein Tools spiegando le prove fatte ed il problema riscontato, ma loro hanno ignorato la mia mail dandomi una risposta preconfezionata. La loro risposta: “corrente troppo bassa perché il tester la misuri”, ma se avessero letto che ho testato l’oggetto con un carica batterie Apple da 30W con un MacBook, avrebbero potuto risparmiare una risposta così sterile. Ho quindi inviato la foto che pubblico anche quì. Vi spiego cosa mostra, così come l’ho spiegato all'azienda: Ad un carica batteria Fast Charge ho collegato un tester analogo ma per Micro USB che mostra un passaggio 0,71 Aampere, all’uscita di questo entro nel tester KLEIN ET920 che però mostra 0 Ampere, da li entro in un power bank che carica tranquillamente. Si deduce che il tester ha dei problemi nella visualizzazione della corrente ma …. Per la KLEIN, l'immagine non dimostrava nulla e mi suggerivano di rendere l'oggetto perchè non ero in grado di adoperarlo. Visto che ho la reale necessità di un oggetto simile, ho cercato di far comprendere bene alla Klein Tools la problematica, così ho realizzato un video in un laboratorio elettronica. Ora vi descrivo il test, così come ho fatto con la azienda. Fornisco energia da un alimentatore digitale che imposto con corrente massima di output a 5 Ampere; ad un carico fittizio imposto per avere un assorbimento di 1,5 Ampere, tra i due dispositivi è inserito il tester ET920. Una volta dato l’output all’alimentatore, il carico fittizio mostra un assorbimento di 6,4 Watt con una corrente di 1,5 Ampere; l’alimentatore mostra una erogazione di 1,518 Ampere ma il tester continua inesorabilmente a segnare ZERO. Pur avendo inviato questo video due volte all’azienda, non mi hanno mai risposto. Peccato, sembrava un bel prodotto, magari sono stato io sfortunato due volte, ma una azienda che risponde ad un cliente in difficoltà che ha argomentato il problema con dovizia di esempi con: "Since this is the second one and it still does not work, I feel it is something other than this device. Please take or send it back and purchase another manufactures similar item." Non mi vedrà più come cliente.

This Simple and Logical to use, brilliant bit of kit, allows you to check and confirm the output values (Voltage, Current, Capacity, Energy and Resistance) of USB A and USB C charging ports, whether that be USB Wall Sockets, USB Chargers or Battery Power Banks. The ET920 unit is a little smaller than I expected, being slightly smaller than a Credit Card and if it were just a cm or two longer and wider, it would be ideal but it's not the end of the world. The unit is robustly made, the screen is well lit and all data is clearly legible and accurate, albeit some a tad small. The attached input cables are a little stiff and if the USB Socket is 'the wrong way up' (if that makes sense), you have to twist the cable to be able to view the screen but I'd rather that, than suffer flimsy cables and the pluses outweigh the negatives. It does have its limitations, in that firstly, you cannot cross the cables i.e. USB A Input must be used with USB A Output (not USB C). Secondly and this could be a Major Issue for some users, if the Input Charge stops, due to, for example, a low input voltage value, which would happen if the device attached to the output port has become fully charged, the displayed values are NOT stored on the device and are therefore lost. Conclusion: To date, I'm impresses and Well Pleased with my purchase. It could be better but..... I'll update this review if necessary but to date, Highly Recommended!

Das Messgerät zur Messung der Ladestrom, Ladespannung und übertragene Energie wirkt mechanisch und elektrisch stabil. Messwerte werden gut lesbar dargestellt.

Bueno y útil, idénticas medidas de voltaje que la Power Z, recomendado.

Bastante bien acabado, de lo mejor que he visto en este tipo de medidores USB para voltaje, corriente y capacidad. A destacar que no funciona de forma cruzada ni ambos conectores simultáneamente, claro. Es decir, que USB-C entrada con USB-C salida o bien USB-A entrada con USB-A en salida (y no ambas a la vez) La solución obvia en ciertos momentos es usar cables USB-C a USB-A, obviamente y según la calidad del cable ello afectará a la resistencia medida en carga/alimentación. Me está siendo útil para comprobar la salida real de fuentes de alimentación o powerbanks (así como su capacidad real). La pega es que no retiene los datos, de forma que si se interrumpe, pierde los valores de capacidad, por ejemplo. Estaría bien que tuviera memoria para guardar un cierto número de mediciones o el proceso en curso.