I picked up a ground probe one day at All about Fish when I stopped on the way home to grab some food a few years ago. Don't recall the brand. I plug it into a kasa bar with energy monitoring - I think I should be able to see current if there is any - but so far, so good. In theory, I could figure out an automation to trigger a light coming on or something if it has a significant reading - but I haven't done that.
I have an old Fluke77 I used to use at work, it's at least 20 years old and has put up with plenty of abuse. If I lost it, I'd likely replace it in kind since it has been good to me, but basic voltmeters are cheap and it's more capable than most of us need on a routine basis for household power.
If you get a less expensive type, especially an analog type, they may be less protected, so make sure you test it after you use it - for example, if you check something has zero volts, you should then go check a known hot source and make sure it reads what you expect (like 120V at an outlet for AC) - to make sure that zero is really zero, and not a blown fuse or burnt connection. I do this anyway with my fluke most of the time if I'll have my hands on something.