These are tools conforming to the JKA (Japan Karate Association) Tournament Rules & Regulations which facilitate staff operations. There is a score calculator for Kata and a timer for Kumite.
The score calculator calculates the total score automatically excepting the maximum and minimum for the Kata event, so that you need not calculate manually.
The timer for Kumite can ring the first bell. You can configure the match duration and the timing of the first bell according to WKF (World Karate Federation).