A Let-Check is an electronic device used in professional tennis matches to detect service lets.
It is a sensor attached to the net that senses vibrations when the ball touches it. The let-check helps umpires make accurate calls during serves. It's mainly used on show courts in big tournaments.
When the sensor detects a let, it sends a signal to the umpire. This technology reduces human error in calling lets. Let-checks are part of the growing use of technology in tennis officiating.
They help ensure fairness and accuracy in professional matches.