Yes, good work Joe. I am glad that you put in those disclaimers about this making any difference for safety. All the modifications surely made a difference in the survival of the meter but people really still need to understand that this does not make the meter any more suitable for high energy power work. Thanks for the time and money you put into the videos.
I have never made any claims about safety, only robustness. I watched several videos on the UT61E before I made these last two. This included yours.
https://youtu.be/hhBbvIf3E0s?t=84I didn't understand most of your comments about it somehow relating to the IEC standards. The UT513 is an insulation tester and supplies a DC voltage. My guess is had spark gaps been installed the meter would not have survived. I am not even sure if you had MOVs in it like the GS meter that it would make it.
What I don't like about your video is that it leaves people with the idea that the meters can survive 5KV. If you measured the voltage across the meter when you ran the test, my guess is you had no where near the 5KV claimed. If you look at the manual for the UT513, the short circuit current is less than 2mA. The PTC would not even flinch at this. Novices watching that video may think, hey 5KV, let me hook my Brymen to a 5KV 10KW supply.