Magnetic switch is also called reed switch or sensor switch. It has several models for different kinds of cylinders.
CS1-U, CS1-F, CS1-J, CS1-S, CS1-M, CS1-H, CS1-G, CS1-72
AL-03R AL-07R AL-13R AL-17R AL-20R AL-21R AL-41R AL-70R PBO-01 PBK-01 PBK-02 PM-R-04 PM-R-06 PM-R-08 PM-R-10 PM-R-12 PI-01 PI-02 PI-03 PI-04