IFM electronic IES259 Inductive sensor; M8 x 1 / L = 27.5 mm; Sensing range 3 mm flush mountable; normally open; DC; 5 m PUR-Cable; IP 65; IP 66; IP 67; IP 68; IP 69K; 2-wire; Ambient temperature -40...85 °C; Switching frequency 800 Hz