Bubba Watson's most expensive piece of equipment at the British Open is a $825,000 watch

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Bubba Watson's most expensive piece of equipment at the British Open costs more than three-quarters of a million dollars, and all it can do is tell him how hard he is swinging and whether or not he will make his tee time.

In 2014 Richard Mille introduced a new $825,000 RM 38-01, a mechanical tourbillon watch with a titanium case designed just for Watson. Only 50 were made.

Beyond the light weight and style Richard Mille watches are known for, the most striking feature of the 38-01 is a g-sensor on the face that's capable of measuring the g-force of Watson's swing up to 20 Gs.

It also comes in Watson's favorite color, green, matching the green jacket he won at the Masters.

Richard Mille

This is actually the third watch designed for Watson by Richard Mille. Watson has been wearing the watches in tournaments since 2011.

He was even wearing a previous model when he won the Masters in 2012.

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And he was wearing what looks like the same model Richard Mille watch during Tuesday's press conference at the Open Championship to be played at St. Andrews.

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The high-end Richard Mille watches are no strangers to the world of professional sports.

Rafael Nadal has worn Richard Mille watches since 2010, even while playing. His latest model is the RM27-02 which has a retail price of $775,000.

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Rafael Nadal plays in his new Richard Mille timepiece