Looking for a 510 Volt Meter

[HKTrent]

I have single volt meter of the lucite type that madvapes had in stock once upon a time. I need to get 4 or 5 more of these but they are out of stock friggin everywhere. If anyone has or knows where to find what I'm after, shoot me a link please.
I may also give a go at building my own if I can;t find what I'm after so if anyone has schematics, links, tips that will help, this will be much appreciated as well.

 

[LucentShadow]

mad vapes is the only place that I know of.

They aren't too hard to make - just a 510 battery connector to 510 atomizer connector, with a voltage indicator connected in parallel between them. mad vapes carries those parts. Just need something to put it all in.

Here's a link to a simple diagram.