The Start Judge SJ2 is a false start system for track & field to monitor the start of running competitions up to 400 m. It consists of the Start Judge transport cart SJT2 with integrated controller and battery. The transport cart can store the complete system. The sensors SJS2 are mounted on each starting block. The integrated loud speaker system enables the starter to give commands to the athletes. The start tone (simulated start shot) is released through the speaker integrated in the start sensor and the BANG. By this, all runners can hear the start tone at the same time. With a radio push button WTN-PB one can move around and still trigger a false start at any time.

Systems are available in two version: cable or radio.