What is this - Hunter G111 light bulb

[Nigeltufnel]

The light bulb that illuminates the level in one of my Hunter optical heads is out (late '80s-early '90s vintage Hunter G111) so I decided to replace it. Upon disassembly I found the bulb mounted on a separate board, the bulb having three electrodes and a clear liquid that does not reach to the top of the electrodes. A search of the part number reveals nothing and I can't find any similar bulb. Anyone know where to find one or a suitable alternative that can be soldered onto the board.

 

[alcorelli]

Are you sure it is a lamp?

Looks like it may be a device that senses level?

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[Nigeltufnel]

You know what - I believe you are right. Looking closer I see the light is integrated in the level. Thanks for your help!