Unwelcomed attraction.

[ppppenguin]

My HV probe isn't potted. The string of 33M is in a PVC tube which is within a paxolin outer tube. The HV end is sealed with Araldite. There's a SOT resistor in series to set calibration and a 4M7 from the meter end to the earth clip. It originally worked with an ordinary 50uA analogue multimeter to give 25kV FSD. So you have to mentally allow a factor of 2. I now use it with a DMM so I still have to do mental arithmetic.