Selecut is a single channel register control for printing presses and converting machines. Selecut is particularly adapted to maintain the front/back register and insetting. The equipment detects the marks trough just one fiber optics scanning head. Mark recognition is automatic. The equipment includes as option an LCD screen for data setting and controlling with a digital oscilloscope. The mark detection is realized with LED fiber optics scanning heads connected to an amplifier with automatic gain control.