My gate has play and opens/closes easily in the wind. There's also the usual gap to contend with. I have used a typical alarm reed switch and have had many false alarms due to the issues above. So far, after a few days of use, I can happily report that I haven't had any false alarms. The contact works exactly as I had hoped.
Adjustable Regulator Generator PEMENOL Controller
9 Review
5Pcs 19Mm 12V 24V Waterproof Latching Push Button Switch With Wiring Harness And LED Indicator Light, Pre-Wired SPDT Self-Locking 4 Pin Marine Metal Switch For Boats Cars Trucks (Blue)
22 Review
TWTADE/AC 24V 10A Coil Electromagnetic Power Relay 8 Pins 2DPT 2NO+2NC With Indicator Light And Socket Base -YJ2N-LY
9 Review
Adjustable AC Current Sensing Switch: SZC23 No AL-CH Model, 0.2A-30A Range
14 Review