High-performance ultrasonic double-sheet control especially for the probing of corrugated cardboard as well as plastic plates several mm thick. 3 control inputs for Teach-in, trigger, and external sensitivity settings for the material. Teach-in option e.g. for probing plates stuck together with an oil film. Compact design in M18 x 1 threaded tube. Reliable detection of single and double sheets. No Teach-in needed (plug and play). Double-sheet and missing-sheet output. Working distance between the transmitter and the receiver selectable from 30 to 70 mm.