This item: Vibra Score Tennis Scorekeeper and Vibration Dampener. $949. +. SkorKeep - Tennis Score Keeping and Vibration Dampening in One Device! $995. +. Scoring Right Portable Tennis Racket and Padel Scorekeeper, Easily Mounted Small Score Board to Keep Score of Points, Games, and Sets, ITF Conforming and Lightweight Mini Score Keeper, 1.9g.
https://www.amazon.com/Vibra-Score-Scorekeeper-Vibration-Dampener/dp/B0083JAQY0