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Impression:Good stuff for reading amps in cellphone chargers;

I got these to keep an eye for variable voltage/ampers on cell phone chargers. This works also to find out if your charger´s cable is working. The price tag is much lower nowadays, so who not getting one of these "usb doctors"?

Impression:Useful;

Useful to test if it's the charger or the cable that's at fault.

Impression:Quite good;

This tool works as expected, switches between Voltage and Current automatically.

Impression:Quite good;

Compact tool to measure USB output voltage and current. Results are fairly accurate. Price is also attractive. Recommended to all hobbyists.

Impression:good;

Maybe its just me, but i always get about half the amperage i sholud get. I know the charger and cable are delivering 2A because of charging times, but tester indicates only 1A.

Impression:excellent;

muy buen producto para su bajo coste, es muy bueno para efectuar mediciones de los aparatos conectado por puerto usb, indicandome el amperaje y el voltaje que circula por la pieza que se desea medir, esto tambien ayuda a proteger los puertos usb de la PC ya que los que vienen incorporados solo y... muy buen producto para su bajo coste, es muy bueno para efectuar mediciones de los aparatos conectado por puerto usb, indicandome el amperaje y el voltaje que circula por la pieza que se desea medir, esto tambien ayuda a proteger los puertos usb de la PC ya que los que vienen incorporados solo soportan 500mA y si un aparato conectado al mismo supera esa carga puede quemar dichos puertos, el unico contra es que el material es algo delicado, pero haciendo un buen uso puede ser duradero Read more

Impression:excellent;

Pros: I had problems at times with charging my smartphones and other devices, wondering why some take a long time and others don't. Using this, I was able to see why the slow charging devices were slow charging, and it really helped so much. Cons: The L shape of this product may not play nice USB... Pros: I had problems at times with charging my smartphones and other devices, wondering why some take a long time and others don't. Using this, I was able to see why the slow charging devices were slow charging, and it really helped so much. Cons: The L shape of this product may not play nice with some USB port orientations, and may block other ports from being used. Other thoughts: I'm really glad such a thing existed, because knowing the output of a particular USB port is very important, as I've had Hard Drive failures prior to this and those HDD failures were always due to lack of power/sudden power loss. Read more

Impression:excellent;

I got this because i have been really interested in usb devices and now that they are so popular 5 volt devices are becoming a standard. This device couldn't be easier to use, just plug it in and it displays voltage and current. The display slowly cycles through both readings. This unit also has... I got this because i have been really interested in usb devices and now that they are so popular 5 volt devices are becoming a standard. This device couldn't be easier to use, just plug it in and it displays voltage and current. The display slowly cycles through both readings. This unit also has a 3 amp rated measuring range and though i have not tested it to that high of a current, it does have a good and consistent reading range. I also tested this in conjunction with a fluke 85 and the readings were very close. Pro: Accurate and reliable Easy to use con: It isnt as shinny as i thought :p Read more

Impression:Good stuff for reading amps in cellphone chargers;

zobrazuje napětí a proud po 5 vteřinových intervalech. Dobrá věc pro posouzení funkce nabíjení různých zařízení.

Impression:Quite good,Good stuff for reading amps in cellphone chargers,nice leds;

Easy of use and works great. Switch before voltage and current in cca 3 sec intervals. Big light digits.