Neon based capacitor leakage tester

[ppppenguin]

The high voltage resistors are probably VR37. Used to be rated at 2500V when they were made by Philips but they seem to have had an upgrade to 3500V under Vishay. Excellent parts. I made an EHT probe from a string of 33M resistors over 40 years ago. I still use it.
https://www.vishay.com/docs/28907/vr25vr37vr68.pdf