I made a portable ion probe out of one of those electric fly swatters. See this 
<https://groups.google.com/d/topic/neonixie-l/kErm8fwJtc4/discussion>topic.

Re. elements not lighting up - only the lead up to the element on my flaky 
6844A tubes will glow unless I pump it with more current and then the glow 
reluctantly moves up to the element itself.

On Wednesday, June 7, 2017 at 8:05:20 PM UTC-4, Pramanicin wrote:
>
> That exactly what I use mine for....very quick test to see if it's lost 
> gas...
>
> Sent from my iPhone
>
> On Jun 7, 2017, at 16:47, Robert L <boble...@gmail.com <javascript:>> 
> wrote:
>
> Funny you should mention a plasma globe... I have one arriving tomorrow. 
> Was thinking of one as a quick and dirty check for gas inside theenvelope.
>
> I'll try running one or more of the unresponsive segments for awhile... 
> Not optimistic as it looks like glow just near the tube base. Not a hint of 
> any glow on the element proper. 240 V measured across the tube at 10 mA, 
> but absolutely no glow on the element. Have you seen something like this 
> recover?
>
> I'm used to seeing at least a partial element glow with the glowing area 
> maybe moving around a bit... Not used to completely dark elements.
>
> Anyway, to be continued!
>
> B
>
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