For detection of transparent to opaque labels with slit widths up to 3 mm and depth 69 mm, M.D. Micro Detectors has come up with the ultrasonic FC8 series. Its compact aluminum body comes with a M8 4-pole connector and Lo/Do configurable NPN/PNP transistors. Complete with dynamic and remote teaching capabilities, it operates with switching frequencies of up to 1500 Hz.