Lot of 4 Underwater Sensors with 6ft Cables - Unknown Purpose

Description

Thank you for your interest in this Lot of 4 Underwater Sensors with 6ft Cable - Unknown Purpose
These sensors were removed from a lab that recently sold off some assets
Unfortunately we have no idea what the sensors do though they appear sealed for underwater use and each features a cable roughly 6ft long
Our guess is they are some sort of antenna or perhaps measure something like temperature of the water
We did receive them the same day our underwater sensors with 25ft cable (also on eBay) came in, so our assumption is their purpose may be related (perhaps one is a transmitter and the other a receiver)
If you recognize them please let us know so we can update the listing for perspective buyers