[bathyspheric]

> The lost capsule is a density gauge, commonly used in mining and forms part of a level sensor.

https://www.abc.net.au/news/2023-01-30/how-wa-authorities-se...

... possibly like this?

https://www.vega.com/en-au/products/product-catalog/level/ra...

[hef19898]

Cool, thanks a lot!