The Festo SME-10F-ZS-24V-K2,5L-OE is a reed magnetic proximity sensor designed for round-slot mounting — common on pneumatic cylinder tie-rod or T-slot profiles. It switches a normally open contact at up to 800 Hz, with an operating voltage range of 5 to 30 V AC/DC and a maximum output current of 100 mA. The 2.5 m cable gives you a bit of reach back to the terminal block without a junction box.
Rated IP65 and IP67, the sensor body and cable entry handle washdown and damp environments — fine for food-and-bev or outdoor machine cells. The reed switch is dry-contact; no leakage current when off, but the 3 VA / 3 W maximum contact rating means you're driving a PLC input or a small relay, not a contactor coil directly. Tightening torque for the mounting screw is 0.2 Nm — easy to overtighten in a T-slot, so use a torque-limiting driver.