A sensor (10) having a housing (12) is provided which has a main housing part (14) and a connection part (16) having a connection (18, 20, 22), wherein the connection part (16) is movably attached at the main housing part (14), in such a way that the connection (18, 20, 22) is selectively accessible from two sides of the housing (12). In this connection the connection part (16) has at least three connections (18, 20, 22) and is movable at the main housing part (14) in such a way that the at least three connections (18, 20, 22) are selectively accessible from two sides of the housing (12).