Wired Door Contact Sensor NO NC Surface Mount Magnetic Reed Switch Brown 3 Pcs Roller Bearings Needle Ampere Panel Meter for

Needle Ampere Panel Meter for electronic applications

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Wired Door Contact Sensor NO NC Surface Mount Magnetic Reed Switch Brown 3 Pcs Roller Bearings Needle Ampere Panel Meter forDescription The Magnetic Contact Switch is with durable PVC housing for better rust resistance. Designed for use with window and door alarm systems, such as the garage, industrial warehouse, and shops, etc. NC means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separates, the circuit is not conductive ( light off ). NO means Normally Open: when the magnet separates, the circuit is conductive( light