What are those guys with that weird "gun"

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  • AceKingHigh
    SBR MVP
    • 10-23-09
    • 3888
    #1
    What are those guys with that weird "gun"
    Hey,

    I was wondering what are they doing? Those guys who sit next to the umpire chair... Anyone knows?
    Tags: None
    • pattymayo
      SBR Posting Legend
      • 05-19-09
      • 10221
      #2
      serve speed pal

      common
        Comment
        • AceKingHigh
          SBR MVP
          • 10-23-09
          • 3888
          #3
          Can't be serve speed only, as guy moves like crazy in every shot..
            Comment
            • SirtySree
              SBR MVP
              • 12-19-13
              • 2370
              #4
              they measure speed of ground shots as well as serve
                Comment
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