For one outlet I'm working on, the tester screwdriver stopped lighting up, it used to before with same exact wires a few days ago, but now doesn't. I was cutting and replacing old wires whoch took some time but touching the old or new wires shows nothing.
The screwdriver works on every there outlet, it's Stanley and it says 100v - 500v AC. Here it's euro standard, where devices are rated 240V 10A. The outlet works, but I'm afraid I may have done something accidentally that let the outlet only output less than 100v, which is bad.