The Festo SME-10-SQ-LED-24 is a magnetic reed proximity switch rated for 12-27 VAC, with an integral LED indicator for visual status at the sensor head.
This switch is built for cylinder-mount or bracket-mount positions common on pneumatic actuators and linear slides. The LED gives you a quick visual check without breaking out a meter — handy when you're walking a route and need to confirm a sensor is making the magnet.
