Testing a 1 prong Wif sensor with a multi meter

[gsc1ugs]

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

 

[danadak]

You have a picture and part number for sensor ?

 

[gsc1ugs]

Cant see any numbers 1 prong plug and this slots in filter, been told earth the metal
Cased filter housing

 

[ChrisP58]

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.

 

[gsc1ugs]

Thats it on the right, like i said no earth just one prong in connection, the lead that plugs in reads 1.246 ohm ignition off