I just replaced my old red Zerostat because it no longer seemed to function properly. I now have a new blue Zerostat which works great. The first thing I noticed is that the new one emits a slight buzzy or grainy sound as the trigger is pulled and released which my old one did when it was new but no longer did when I replaced it.
I also try pulling the trigger with the end about 1/4" away from my cast iron radiators while in the dark. I see what looks like a tiny lightning bolt between the end of the gun and the metal radiator.
I also try pulling the trigger with the end about 1/4" away from my cast iron radiators while in the dark. I see what looks like a tiny lightning bolt between the end of the gun and the metal radiator.