SICK Ultrasonic Threaded Barrel Proximity Sensor, M30, 3.4 m Detection, PNP x2 NO/NC, 9 → 30 V dc

High measurement accuracy thanks to time-of-flight measurement
Independent of material shape (including films, glass and bottles)
Teach-in
Binary or analogue output
Automatic selection between current and voltage
Invertible binary switching output
Insensitive to dirt, dust and fog