













⚡ Power up your tech IQ with Klein’s ET910 – the ultimate USB charge detective!
The Klein Tools ET910 USB Power Meter and Tester is a compact, USB-powered device designed to measure voltage (3-20V DC), current (0.05-3A), capacity, energy, and resistance on USB-A ports, including Qualcomm Quick Charge. Featuring built-in test loads (0.5A, 1A, 2A, 3A) and up to 1000 hours of continuous monitoring, it offers precise diagnostics for USB charging performance. Its durable polymer build and clear LCD display make it an indispensable tool for professionals troubleshooting USB power delivery.


















| ASIN | B07GXSRCWM |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 118,483 in DIY & Tools ( See Top 100 in DIY & Tools ) 174 in Voltage Testers |
| Colour | Clear |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,559) |
| Date First Available | 30 Aug. 2018 |
| Display style | LCD |
| Finish | Brushed |
| Included components | USB Digital Meter and Tester, USB-A (Type A) |
| Item Package Quantity | 1 |
| Item Weight | 79.2 g |
| Item model number | ET910 |
| Manufacturer | Klein Tools |
| Material | Polymer |
| Measurement Accuracy | See Manual For Measurement Accuracy |
| Measurement System | Metric |
| Part number | ET910 |
| Pattern | Electric Circuit Testing Device |
| Power source type | Usb-powered |
| Product Dimensions | 28.47 x 5.41 x 2.49 cm; 79.38 g |
| Shape | Rectangular |
| Size | 0.98 in*11.21 in*2.13 in |
| Special Features | Current Test Loads: 0.5A, 1A, 2A, 3A |
| Style | USB-A Tester and Meter |
S**B
An Impressive and Accurate, Must Have Tool!
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!
S**R
Useful addition to toolkit.
A well made useful tool from Klein. It will test the supply from a USB socket, show the supply voltage and how much current is being drawn from the item being charged. Well worth the money, and essential for troubleshooting phone charging issues: already found a dodgy wireless charging pad that was intermittent.
G**D
Nice tester
A well designed USB power meter, it’s nice to have a unit with tails (cables) as it makes it easy to view the screen when plugged into difficult to reach sockets. Build quality seems good and measurement is accurate. I do wish however they included a power calculation and displayed the current load in Watts rather than just amps and volts with Energy.
Y**M
Excellent.
Particularly useful to check USB items can pull the required current. For a item to pull full current you must know the USB adapter or charger is capable of providing that current or above. For example some adapters rated at 2.0amp may only provide 1.85 amp. The usb item you plug in could be rated at 2.0 amp but pull more. If it does it requires more. Ie 3 amp adapter.
S**N
Very useful indeed
This unit is really helping me to troubleshoot an intermittent iPhone charging issue (which Apple tech support were unable to solve); being able to check charging voltage and current in real time has allowed me to see when the phone is not charging properly. Reading some of the negative reviews complaining about the unit not working on USB C, I think it should have a higher overall star rating; the manual clearly states that for the unit to work when using USB C it has to be connected to a downstream device. I suspect this may be a case of some reviewers criticising the product without having read the manual. It gets a very definite 5* rating from me.
J**.
Good gadget.
Good bit of kit. Seems to work well and feels well made.
A**R
Great item
Good item well worth having
A**R
love it
great
F**O
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.
M**L
Das Messgerät zur Messung der Ladestrom, Ladespannung und übertragene Energie wirkt mechanisch und elektrisch stabil. Messwerte werden gut lesbar dargestellt.
L**S
Bueno y útil, idénticas medidas de voltaje que la Power Z, recomendado.
T**E
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.
M**T
Great Klein product. Test feature is a huge plus. I Bought it to test loads on my usb/ plug and usb power supplies laying around . Does everything it advertises, easy to use
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