Brymen BM257s saves me from mains shock therapy

[bluevd]

Howdy folks,
Long story short: a friend of mine is renovating an appartment he just bought and after a quick look, I advised him to also redo all the mains wiring since the old one is from the comunist era and has had "upgrades" along the way. It's a mix of aluminum and copper wires spliced in the most nightmarish ways. So, I started work, removed the fuses, removed the fuse box and connected a single fuse for a light and a plug to be used during the work (fuse is directly connected to the meter). Started to prepare the walls for the wires (in Romania all wires are ran through conduits which are burried in the walls). Hit what seemed to be and old distribution box and while trying to seperate the wires before removing them to have a clear path, the little bm257s staryed beeping. It was set in EF mode as I used it to check all the wires that were disconnected from the fuse box. What surprised me was that the DMM was between my feet and I gripped the wires by the ibsulation with pliers. If  the thing didn't start beeping, I would have just cut the wires as all the wiring in the fuse box was "cold". While I do use PPE, it still would have been a nasty surprise. Bellow is a link to a short video showing the setup. I'm actually surprised how much the human body transmits electrical fields and while in the video I have my gloves off, it's the same with them on. Guess this little buddy saved me from a nasty surprise.
https://youtu.be/2uC-8aUpfwM?si=FVrZBVg4jKIa6KhR