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Dear friends,
I found it is impossible to online buy a cheap Non-contact Direct Current voltage tester pens.
They only sell AC pens.
Does anyone know where to buy cheap Non-contact Direct Current (DC) tester pens , that is not those very expensive Fluke pens?
Thanks for all your great help and May God bless you and your family 
I was going to suggest you google "diy magnetometer probe"
And this popped up
I am skeptical... Must be a hall senor
Thanks for posting, sorry I don't have an answer
anniel747 It says it does it all. 
We'll see what it does and doesn't respond to. I suspect that one of the negative reviews on Amazon was because the reviewer didn't understand that you have to have current flow to create the magnetic field in electrical circuits. Thanks for the reminder. 
That is exciting news! I already have egg on my face, I honestly had no idea magnetic detectors pens existed!! Built-in self test magnet included, it sounds like a genuine product. I have no clue ho
w well it works, but I am grateful you have decided to give it a try fingers crossed it's a winner!
Beyond my budget for personal use, a railroad meter...
