Balluff BMF 307K-R-AS-L-3-S49-00,2 0.2m T-slot sensor, PNP NOBalluffs magnetic field sensors for T slots detect the piston position without contact through the cylinder walls. Features: can be mounted directly into the slot, firm grip, can be mounted flush for space critical applications, can be used for cylinders and grippers with strong or weak magnets, bright LEDs. Extremely short configurations as well as sensors with metal housings or magnetic field sensitive electronics are available.