In/Out Tennis Line Call Device
Like a ref that takes subjectivity out of shot calling, the In/Out Tennis Line Call Device is likely to save a few friendships of ultra-competitive but casual tennis players. It takes about a minute to install the GoPro-sized device to a net post before it starts calling the shots, auto-calibrating to the court in question and analyzing every ball with 99% accuracy. The impact of each ball with the ground is recorded and analyzed by the device in real time to be later viewed on any Android or iOS smartphone or tablet, and closer calls can be re-examined as it records them in HD. And since it lights up green or red at every shot that’s in or out, respectively, with a sound to signal those out of bounds, it eliminates a lot of ambiguity and assumptions from the game.
Find it at In/Out – $200