USB Doctor Multifunction Tester. Delivered, from China £3.72 @ Aliexpress
326°Expired

USB Doctor Multifunction Tester. Delivered, from China £3.72 @ Aliexpress

34
Found 11th Dec 2017
there are cheaper versions of this that only show voltage & Amps, maybe some extra's.... but this item is the dogs bo***cks, don't rely too much on the badly translated description... here's a run-down of what it does.

Volt's, Amps (3.5A), Ohms, split Data line Voltage, temperature, capacity, active timer, settable power off timer, Data pass-through, working voltage 4V-30V

i have a few of these different USB doctors but this model is alway's my "go-to" tester... a crucial bit of kit to test the current consumption & capacity of your devices (phones, tablets, power banks, USB cables, batteries, Etc.)..
cheapest i've ever seen them right now. but it's the slow boat from China, rated 4.9/5 with this seller.
Community Updates

Groups

34 Comments
link didn't work for me
louiselouise4 m ago

£3.27 here https://www.ebay.co.uk/itm/302383674652


As long as you aren't in a RUSH! "Estimated between Wed. 27 Dec. and Tue. 6 Feb."
louiselouise8 m ago

£3.27 here https://www.ebay.co.uk/itm/302383674652


yes,loads of different ones on aliexpress. some cheaper than this but op said this one was good, sadly link doesnt work for me
nihcaj25 m ago

As long as you aren't in a RUSH! "Estimated between Wed. 27 Dec. and Tue. …As long as you aren't in a RUSH! "Estimated between Wed. 27 Dec. and Tue. 6 Feb."



Anyone who orders from Aliexpress (or Gearbest, for that matter) will have grown Methuselah's beard by the time it arrives...

In saying that, I did have one Aliexpress order that dispatched within one day lately - usually they are super-slow. Aliexpress state for the UK, by default, "Estimated Delivery Time: 30-50 days".

This seems to use the same display, so I'm sure it's just a clone - even the description is more or less word-for-word the same.

Not sure why y'all can't get the link to work, works with me aliexpress.com/ite…tml
Edited by: "louiselouise" 11th Dec 2017
crucial?
Cheers. Just signed up to Ali Express and got an additional discount bringing it down to £1.98!
Can this be used to check USB A and C cables to make sure they conform to spec?
louiselouise1 h, 6 m ago

£3.27 here https://www.ebay.co.uk/itm/302383674652


i have one of these, but doesn't have as many functions... but a good find at that price.

Limitless.26 m ago

Can this be used to check USB A and C cables to make sure they conform to …Can this be used to check USB A and C cables to make sure they conform to spec?



this can be used to check the cable resistance (Ohms) on the 5V & Gnd lines, the lower that number the less power is lost in the cable (able to supply more current), can check any cable with a USB plug or use an adapter.
WizardOfWelshness8 m ago

i have one of these, but doesn't have as many functions... but a good find …i have one of these, but doesn't have as many functions... but a good find at that price.this can be used to check the cable resistance (Ohms) on the 5V & Gnd lines, the lower that number the less power is lost in the cable (able to supply more current), can check any cable with a USB plug or use an adapter.



Thanks, useful to know, assumed it was the same - not trying to gatecrash anyone's deal, I just always shop around before I hit Buy
Is there a micro USB version or could I use an adaptor lead to test micro sockets, the ones I have the most issues with. Thanks
Is this one of those things that can let me slow charge my 12v laptop from a 5v USB supply/power bank?
Yeah great way to upload malware onto your devices, worth the money then
louiselouise1 h, 37 m ago

Anyone who orders from Aliexpress (or Gearbest, for that matter) will have …Anyone who orders from Aliexpress (or Gearbest, for that matter) will have grown Methuselah's beard by the time it arrives...In saying that, I did have one Aliexpress order that dispatched within one day lately - usually they are super-slow. Aliexpress state for the UK, by default, "Estimated Delivery Time: 30-50 days".This seems to use the same display, so I'm sure it's just a clone - even the description is more or less word-for-word the same.Not sure why y'all can't get the link to work, works with me https://www.aliexpress.com/item/Multifunction-4-30V-Digital-LCD-display-USB-Power-Bank-Charger-Capacity-Current-Voltage-meter-USB-Testers/32754631489.html



ordered the wifi camera someone posted on here from Gearbest and got it delivered within a week
£3.69 via the app
louiselouise2 h, 4 m ago

Anyone who orders from Aliexpress (or Gearbest, for that matter) will have …Anyone who orders from Aliexpress (or Gearbest, for that matter) will have grown Methuselah's beard by the time it arrives...In saying that, I did have one Aliexpress order that dispatched within one day lately - usually they are super-slow. Aliexpress state for the UK, by default, "Estimated Delivery Time: 30-50 days".This seems to use the same display, so I'm sure it's just a clone - even the description is more or less word-for-word the same.Not sure why y'all can't get the link to work, works with me https://www.aliexpress.com/item/Multifunction-4-30V-Digital-LCD-display-USB-Power-Bank-Charger-Capacity-Current-Voltage-meter-USB-Testers/32754631489.html


I find AliExpress quicker then most other sites, been getting stuff within a couple of weeks lately
wow, would be cool hack on raspberry pi! using the display unit and else. heat added!
The best version has an alarm as well
Spark1 h, 55 m ago

Is this one of those things that can let me slow charge my 12v laptop from …Is this one of those things that can let me slow charge my 12v laptop from a 5v USB supply/power bank?


I use similar ones in work to see if phones are charging properly and for general diagnosis on power draw on USB devices etc. £5.03 on eBay for the same device from the UK if you don't want to wait.

"0-99999 mAh Capacity 0-150W Power Digital Display USB Multifunction Tester SA"
Edited by: "fishmaster" 11th Dec 2017
fishmaster19 m ago

I use similar ones in work to see if phones are charging properly and for …I use similar ones in work to see if phones are charging properly and for general diagnosis on power draw on USB devices etc. £5.03 on eBay for the same device from the UK if you don't want to wait."0-99999 mAh Capacity 0-150W Power Digital Display USB Multifunction Tester SA"



I was told that one was slightly different to the one offered on Aliexpress
fishmaster22 m ago

"0-99999 mAh Capacity 0-150W Power Digital Display USB Multifunction …"0-99999 mAh Capacity 0-150W Power Digital Display USB Multifunction Tester SA"


99999mAh is I think 10 amps. Good luck getting that through a USB.

Like many Chinese gadgets it will either work fine or die within a month, quality control is often a problem..
louiselouise13 m ago

I was told that one was slightly different to the one offered on …I was told that one was slightly different to the one offered on Aliexpress


Actually yes they look different, the one in this deal appears to give more information on the display. I only use them for simple diagnosis, you can buy High Precision Multi Function Power / USB / Battery Tester for £12.99 if you're looking for features such as logging.
Edited by: "fishmaster" 11th Dec 2017
col111 h, 38 m ago

I find AliExpress quicker then most other sites, been getting stuff within …I find AliExpress quicker then most other sites, been getting stuff within a couple of weeks lately




10-14 days is normal for a typical Aliexpress mail service - obviously faster if you choose DHL etc.
missionhall2 h, 34 m ago

Is there a micro USB version or could I use an adaptor lead to test micro …Is there a micro USB version or could I use an adaptor lead to test micro sockets, the ones I have the most issues with. Thanks



something like this you mean? aliexpress.com/ite…tml
to test your Android charger output? there's loads of USB adapters to choose from.


Spark2 h, 29 m ago

Is this one of those things that can let me slow charge my 12v laptop from …Is this one of those things that can let me slow charge my 12v laptop from a 5v USB supply/power bank?


Sorry Spark, this just a tester, you'll need a "step-up" or "booster circuit" for that.
WizardOfWelshness1 h, 53 m ago

something like this you mean? …something like this you mean? https://www.aliexpress.com/item/New-Black-USB-2-0-Type-A-Female-to-B-Female-Micro-USB-5-Pin-Data/32757514417.htmlto test your Android charger output? there's loads of USB adapters to choose from.Sorry Spark, this just a tester, you'll need a "step-up" or "booster circuit" for that.


I've been looking for something that would allow my 12V DC laptop to charge from a USB power bank and someone on another forum said this would work.

aliexpress.com/ite…tml

I'd ideally like something with a case though if I'm going to carry it around and use it on planes etc.
Spark3 h, 6 m ago

I've been looking for something that would allow my 12V DC laptop to …I've been looking for something that would allow my 12V DC laptop to charge from a USB power bank and someone on another forum said this would work. https://www.aliexpress.com/item/1PCS-QC2-0-qc3-0-Tester-Automatically-Detects-Phone-Quick-Charge-Voltage-Meter-Simulator-Trigger-9V/32771660912.htmlI'd ideally like something with a case though if I'm going to carry it around and use it on planes etc.



I have tried one of these to charge my EzBook Pro 3, without success, using a couple of different QC powerbanks. charging start then drops out. I seems that the powerbanks are only giving 11.9 V. Not sure if the laptop is needing 12V+. I have tried using the variable voltage facility of QC 3.0 but can't get over 11.9 with my powerbanks. If you find a working solution let us know.
bytemaster27 m ago

I have tried one of these to charge my EzBook Pro 3, without success, …I have tried one of these to charge my EzBook Pro 3, without success, using a couple of different QC powerbanks. charging start then drops out. I seems that the powerbanks are only giving 11.9 V. Not sure if the laptop is needing 12V+. I have tried using the variable voltage facility of QC 3.0 but can't get over 11.9 with my powerbanks. If you find a working solution let us know.


Thanks. The only real info I found so far was on this page tbh.

techtablets.com/for…er/
Spark7 h, 11 m ago

I've been looking for something that would allow my 12V DC laptop to …I've been looking for something that would allow my 12V DC laptop to charge from a USB power bank ...


A SEPIC converter [ eBay example ] provides a steady output voltage at a value set by adjusting the screw on the potentiometer (blue one on the board). But bear in mind the power output of the powerbank must match the power demand of the laptop (power = voltage * current)
JetStream5 h, 37 m ago

A SEPIC converter [ eBay example ] provides a steady output voltage at a …A SEPIC converter [ eBay example ] provides a steady output voltage at a value set by adjusting the screw on the potentiometer (blue one on the board). But bear in mind the power output of the powerbank must match the power demand of the laptop (power = voltage * current)


Thanks. Would that be possible though considering the laptop uses a 12v supply and USB is capped at 5v?
Spark12 h, 49 m ago

Thanks. Would that be possible though considering the laptop uses a 12v …Thanks. Would that be possible though considering the laptop uses a 12v supply and USB is capped at 5v?


Depends on the power ratings. What are the voltage and current ratings on the laptop power supply and the laptop? Usually these are mentioned in the product labels. Given the above discussion I'm assuming the voltage rating of both is 12V. What about the current rating? (Power = Voltage x Current)

Also what is the maximum output current of your powerbank at 5V? Again, should be stated on the product label.

i.e. a powerbank I have has output ratings of 5V/2.4A max. That's 12W. It could be used to power a device needing 12V input as long as the device had an input current demand less than 1A (12W/12V).

Another option would be to buy one of these (AliExpress) along with some 18650 batteries and use it as backup power for your laptop.
Edited by: "JetStream" 12th Dec 2017
aliexpress.com/ite…tml

something like this might work depending on the current draw from your laptop, it will supply 12v at 1.3A (9v at 2.2A or 15v 1A) but this is the casing & electronics only, NO BATTERIES.
it takes the same batteries as found inside most laptops (18650 Li-Ion, in pairs & chain of 3, when they go bad it's almost always only 1 pair gone bad)
They can be dangerous, Lithium batteries can explode or catch fire if shorted so taking apart old laptop batteries should only be done with great care and extreme caution.
if you don't feel comfortable doing it yourself, you could take this to your local computer shop and ask them put put some used batteries in there for you (as they normally get thrown out)... you can buy brand new 18650 cells but they cost a small fortune.
use a phone charger (micro USB) to recharge the power bank, you'll need a 5.5mm-2.1mm adapter for your laptop if it doesn't take that plug.

if that current output doesn't work for you, you might be getting into "jump starter" territory... at which prices i'd rather make my own booster circuit with these. aliexpress.com/ite…tml

@Spark @bytemaster
WizardOfWelshness1 h, 15 m ago

They can be dangerous, Lithium batteries can explode or catch fire if …They can be dangerous, Lithium batteries can explode or catch fire if shorted so taking apart old laptop batteries should only be done with great care and extreme caution.


I would unequivocally second the word of caution from @WizardOfWelshness on careful use of 18650 batteries. Li-ion batteries don't take kindly any form of abuse. It is always recommended to use them in cases that have battery protection circuits built in.

If you would like to discuss in detail the options you try out, open a discussion in the Forums. I'm sure many here would be happy to help.
bytemaster11th Dec

I have tried one of these to charge my EzBook Pro 3, without success, …I have tried one of these to charge my EzBook Pro 3, without success, using a couple of different QC powerbanks. charging start then drops out. I seems that the powerbanks are only giving 11.9 V. Not sure if the laptop is needing 12V+. I have tried using the variable voltage facility of QC 3.0 but can't get over 11.9 with my powerbanks. If you find a working solution let us know.


taking a further look into the spec & power requirements for your Pro-3, 12v 3A (36W) 3.5mm DC jack is the standard PSU output, you'll probably find the above item going into over-current/Auto-off mode...
if you're feeling a little tech savvy, you could get some "TP4056 protected" chargers, a "6 18650 diy power bank" and the boost circuits above (2nd link).
bridge the inputs of 2 TP4056 modules and also the outputs to the batteries which will be in parallel... this should allow up to 2.4A charging if the power supply can handle it.
bridge inputs for 3 or 4 boost modules in parallel, diode the output to a 0.5R resistor (i'd use 0.5 Ohm of wire here) on each boost module, bridge the opposite side of the resistors for output... ensure the output voltage is as exact as possible with each module when under load (use multimeter in Mv), although the modules are rated at 2A Max output each, they'll get warm without heatsinks... so adding more modules will share the work and allow a higher working current while still running cool.
fit it in the empty 6 X 18650 power bank case and fill what space is left with old laptop batteries... you'll need to add a switch somewhere to turn off the boost modules to prevent discharge, no switch between batteries &TP4056... also make sure you use adequate copper wire for battery to booster & output connections.
and if you did all that, you just made your own car battery booster with 8A peak, battery protection & thermal shutdown... but for a 3A laptop, it won't even get warm. (unless you only use 2/3 batteries).
This one from AliExpress has the max output of 21V 3.3A and should comfortably charge 12V 3A laptop.
Post a comment
Avatar
@
    Text