Float & Displacer Operated Level Switches & Tranmitters Jerguson offers a wide array of mechanical switch and transmitter products to provide reliable level measurement for your application. Our caged level switch products feature a unique, tri-magnet mechanism that offers high current, snap-action switching without the use of cams or springs. Products are available with ASME B31.1/B31.3, FM, UL, CSA, ATEX, & PED approvals.