Overhead industrial surface mount magnetic contact switch. 12" Stainless Steel Armoured 22 gauge wiring cable. L-Bracket magnet assembly included. Hermetically Sealed, Gold Plated, Rhodium Reed Switch ...

You might have them on your doors and windows as part of a burglar alarm ... them switches, but they’re also sensors. In fact, they only do the work of a switch while they can sense a magnetic ...