Testing a 1 prong Wif sensor with a multi meter

gsc1ugs

New Member
Could i get advice please on how to test a 1 prong Wif sensor with a multi meter, it only has 1 prong so i dont know where to put the black side of the multi meter, this sensor is on a fuel filter to detect water, i want to know if its broken
 
Cant see any numbers 1 prong plug and this slots in filter, been told earth the metal
Cased filter housing
Please post some more pictures so we can see all sides of the device. include some dimensions.

Also make sure that the camera focus is on the device and not on the background.
 
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