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Charge Doctor USB Voltage & Current Monitor-Tester

-78% Charge Doctor USB Voltage & Current Monitor-Tester

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Good form factor for a device that can measure both USB voltage and current. Appropriate accuracy for this application. Can also measure voltage loss in cables as more current is used - this will show you which cable has the least losses so your device will charge faster. Can show power supplies that are out of spec - I have one that generates 6.25 volts. Can show which power supplies will deliver their rated current. Very few USB power modules will deliver their rated current while maintaining 5 volts.

Brand NA
Model USB-AV
Text Overlay text may vary from pictures shown.
Color Translucent blue + silver
Material ABS
Features Detection range: Voltage: 3~7.5V; Current: 0~2.5A; Error: Voltage: less than +/- 1% Current :less than 2%
Application Compact and easy to carry, no additional power supply, plug and play; It can easily measure the output voltage of the USB port and the device operating current or load voltage
Size:63*21-34*15mmNet weight:15gPackage weight:25gColor:Blue

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Easysync Cables Customer Feedback


25-May-2011 Max Perry NSW  Australia Hi, I received the DB9/RS232 to USB cable this morning. It is working perfectly! I am using it to monitor a Solar Power inverter (which has only DB9/RS232 PC output) using a netbook that only has USB ports. In case you get enquiries from someone else trying to do this, my inverter is a Xantrex GT2.8. Many thanks for your excellent service and product! Cheers, Max Perry
27-Jun-08 Mark Turnbull Hampton VIC AUSTRALIA The adaptor has been running continuously online with a Siemens S5 PLC for 10 hours straight with no issues. You haved saved me at least 300 dollars buying a cable out of Germany using the FTDI chipset. Again Thanx , great product. Regards Mark 
15-Dec-2006 Mark Gibbs Box Hill AUSTRALIA Thanks Penny and Don, Goods arrived on time and in one piece. Pity I didn’t know about these EasySync usb-rs232 4 years ago. I have tried 4 different Keyspan and Prolilific models on two different laptops with nothing but trouble and reliability problems for 4 years. I even bought another desktop pc to get around the problems of bad serial ports. Cheap and unreliable is no bargain at all. Easysync installed first go, ran perfectly first and every time ever since (well for two days anyway). I think I'm in developer heaven. Thanks once again.
Pfaff sewing machine, and Designaknit Professional for Windows 
13-Jul-2005 Ashley Barrington MT BARKER AUSTRALIA  Thanks Don - I experimented last night and the convertor works perfectly.
I was warned that most USB/serial convertors do not work with Win XP.  I have WinXP and have no problems.  I would expect that if anyone has any problems it is only because they have not configured their COM Port correctly in Device Manager. The PC-Designer software for the Pfaff sewing machine allows choice of Com Ports 1, 2, 3, 4 - so there should not be a problem. I experimented last night and found an added bonus: This converter also works with software called Designaknit Professional for Windows - UK software for use with electronic knitting machines. For those of us with serial cables (Silver Link 1) for use with our Singer/Silver Reed(UK&US) electronic kniting machines this converter also works.  There has been no converter that has been successful - and we have been encouraged to purchase a special USB cable which costs around AUD$300.  So I will inform the manufacturer and also some of the knitting machine groups. I have sent an email to them confirming this. http://www.softbyte.co.uk/software.htm Thanks again much appreciated. Ashley Barrington! 
20-Apr-2005 Mark Dyball http://www.bonniedoonlakeside.com.au Australia Gday Don. Well I must say that your USB to COMMs port adapter worked perfect the first time. The security Boomgate system plugged directly into the comms port on the computer and the Wedge Reader plugged into your USB to COMMs port adapter and there was not one problem. The installer was not sure that it would work but was very surprised when It did without a problem. He said that he has had a lot of problems with this type of adapter.
3-Sep-2004 Geoff Douglass Circuitlink International Seven Hills AUSTRALIA thanks Don, we used another adaptor the other day and had no luck at all. Yours worked first time and every time. (Not another testimonial!!!!!) regards
16 Jun 2004 Brian Murtha Zworld.com USA It's an excellent, robust converter, BTW, the best we tested. -Brian
15-Jun-2004 Mark Voevodin mpi32.com Australia The USB Serial port (EasySync Standard) works great to legacy telephone systems (PBX), as these are as hard to interface to as GPS, as most of them need the handshaking lines. We will be recommending to our customers to contact yourselves for their Serial to USB needs in the future.
9-Dec-2003 Peter Gouws Bytes Document Solutions Johannesburg South Africa Hi Sharon, Goods arrived today!!and appear to work well. Thanks again for your Prompt and friendly service. I will definately recommend you guys to others.
5-Dec-2003 Ruary Mackenzie BHP Billiton Port Hedland WA Don, Thank you very much for your quick service.  Ordered late Wednesday afternoon (WA time) and package was recieved in Port Hedland early Friday morning.  USB-RS232 adapters work fine with all software I have tried them with.  Again thank you.  I only wish our other suppliers could be even half as good.
30-Jul-2003 Rod Shannon Ilfracombe QLD AUSTRALIA Sharon,A quick note to say the cable I ordered from you arrived 2 days ago, and I find it works perfectly.  For some reason, other RS-232 - USB converters don't seem to like transferring data between a Garmin GPS & a computer running Windows XP (The computer will spontaneously re-boot during data transfer). However, I find this cable has been working perfectly, and the downloads are trouble-free. It was quick to arrive, and works perfectly. I couldn't ask for more.
7-Feb-2003  Jason Watt. Inner Range Technical Support. Dear Sir, The prevalence of U.S.B. ports being standard on most new Laptops these days is making 9 pin Serial ports either obsolete or an expensive retro fit.  We manufacture Alarm/Access/Automation products and extensively rely on UART/RS232 for, amongst other applications, connection of Laptops to our systems via either direct UART or telephonic dialup. Your EasySync U.S.B. to Serial converter has been tested and approved as a preferred 3rd party product by us at Inner Range for our purposes. I found the installation quick, uncomplicated and transparent to our systems and software environment running under Win2K. We will be recommending EasySync to Installers of our product in the future. Thanks to Chris Olivier for bringing your product to our attention. Regards, http://www.innerrange.com.au/home.html
11-Dec-2002 Dunlop ACT 2615 AUSTRALIA Chris Olivier Dear Sir, Just wanted to let you know how pleased I am with your USB - RS232 converter.  I needed it to direct connect to alarm panels, I had previously tried three others and none of them worked!  I plugged yours in and straight away it worked. Thank you,
30-Nov-2002 Brian Ford Australia Hi,The device arrived a few days after the order. Thanks.
After using a Targus and Belkin USB/Serial convertor for my miniture Data-logger and having nothing but trouble with incomplete session uploads. The product I got from you guys has worked very well and the hair pulling is over. I'm recommending it to others.
1-Nov-2002 Shelton Martin Santa Barbara Ca USA Hi Don, In case you are curious or are planning to build a database for customers to verify that your USB-RS232 adaptor will work with their application, this is from the customer that I purchased the product for "The infrared thermal unit is sold by Mitchel Instruments, Model # MITMX4P.  Lot #2120340401, Sep 2002, Serial # :002".  While the stereo to RS232 cable was defective (very poor workmanship combined with the cheapest parts available) and needed reworking, which cast a shadow of doubt on your product at the start, once the cable from Mitchell was fixed your product worked flawlessly.  Kudos.
16-Oct-2002 Toin Bloo The Netherlands Hello Dontronics, I received your goods today, in good shape. Thank you! And what is even better: it works! (EasySync) Now I'm able to connect the Cygnal microcontroller development kit to my Apple running in Virtual PC and download and control it.
30-Aug-2002 Stephen Scott-Young (pgrad.unimelb.edu.au) Hi Don, The EasySync converters are working fine. Plugging in and loading the drivers contained no suprises - all four converters loaded perfectly. At the moment I only have 2 serial devices connected and running simultaneously, but in a few weeks I will be trying with 4 devices. I'll let you know how that comes along. Thanks Don!
23-May-2002 Peter McConaghy Seven Hills AUSTRALIA Subject: It works!! Hi Don, Got the USB-RS232 adaptor earlier today and it works with our software! Yeh! It's the 3rd one we've tried - our system works on small data packets and the other ones caused timeouts or lost the data totally.

18-Feb-2002 Jeremy Moore Don- Order showed up last Friday.  Thanks, it works great with my Garmin GPS.  It is too bad Garmin has not decided to make their own cable or make their GPS devices USB capable.  Would be pretty easy with these chips!  Oh well... maybe one day... Have a great week. -Jeremy



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  • Brand: China
  • Product Code: Charge Doctor
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  • AUD$8.95
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  • ( USD$1.52 ) ( €uro 1.22 )