I have a differential probe, and an HP 54701A active probe as well.
I was asking about this particular device, not the merits/risks of using an isolation transformer.
I just wanted this device for a bit of extra safety+elimination of variables when something unexpected occurs. I want to use it with my rather simple circuits or defective equipment I am attempting to repair (say I want/need full galvanic isolation). For example, I intend my next significant project to be a low power, adjustable hybrid switch mode+linear power supply. I just want to potentially float what I am working on, perhaps just when powering the device on for the first time, not float say an oscilloscope unless absolutely necessary.
And I am familiar with variacs/autotransformers and I understand the difference between these and isolation transformers. I want to use the isolation transformer+variac to (for example) produce low voltage AC that is not mains referenced, or use it to perform certain EMF/noise experiments/debugging. There are ways to work around these isolation transformer issues.
Various EE videos (Dave, mikeselectricstuff, Mr. Carlson's Lab, Adafruit etc) convinced me to look into getting one, for hands on learning and just as a safety measure in certain circumstances. I may indeed have to modify the device to do what I want.
I have one of these, and find it incredibly useful:
https://www.amazon.com/gp/product/B015OA1J82/![](https://images-na.ssl-images-amazon.com/images/I/41buxS1HiEL.jpg)
Tekpower TP3016M Portable Handheld Variable DC Power Supply with USB Port,
0.3V - 12V @ 0-3.75A or 0.3V-30V@ 1.6A with VC and CC Control,
Upgraded TP3005D,HY3005, Mastech
It's floating and is powered by a 2-wire IEC-320-C7 with no direct earth reference.
I am starting the design process to build a similar device that can also generate low-voltage/current AC as well. Just seemed like a good idea to have an isolation transformer around on my bench for when one is truly needed.
It also looks cool and has two outputs, which means both connected devices would be at the same potential which has some utility.
Did I mention it looks cool?
![Tongue :P](https://www.eevblog.com/forum/Smileys/default/tongue.gif)
Anyways, thanks for the response.
And I am sure the eBay ad details/images are bullshit, but it will make a great teardown video! I like collecting test equipment
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
Dustin