I have just obtained a Clare V.154 "P.A.T" tester.
It has a flash test facility at 3000V or 4000V and a large test probe that looks like a 50s sci-fi film ray gun. I will thoroughly service the instrument before use, and am not inclined to use the flash test facility, but am curious about how it produces the high Voltages. I have not opened the instrument yet so it will be a treat to have a look inside. Circa 1984 I believe.
https://www.physicsforums.com/threads/clare-v154-electrical-tester.933150/