To add-on to wht bro Jervis had mentioned, the 2 x connection for temperature sensor can be use to connect the level sensor too. Meaning to say, both level and temperature sensor have the same type of connector.
From the information I gathered so far, if u gonna connect additional level and temperature sensor, u juz need to purchase an additional adapter rather then the socket panel which may be too expensive/ uneccessary!
Thks to Aquatronic for producing such a great product which is highly scalable to individual needs!