MLB catchers wary of looming robo umps amid rules changes
Robot umps, which started in Atlantic League, to be used in Triple-A
MLB's automated strike zone debuts in Triple A Pacific Coast
Umpire (baseball) - Wikipedia
Robo-umpiring has arrived in the minor leagues. Here's how it's
They're testing a ball/strike challenge system in the minor
Now Calling Balls and Strikes: Robot Umpires - WSJ
Robo Umps” Coming to all AAA Ballparks in 2023 - Minor Leagues
MLB catchers wary of looming robo umps amid rules changes