Tennis sensors (zepp 2)?

ichaseballs

Rookie
I don't see much on this. It seems to be the only surviving tennis sensor from a few years ago. When did the v2 come out? What's different than the original?
https://www.zepp.com/shop/

Hoping someone can provide some feedback on their experience.
 
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zinzan8

Rookie
I don't see much on this. It seems to be the only surviving tennis sensor from a few years ago. When did the v2 come out? What's different than the original?
https://www.zepp.com/shop/

Hoping someone can provide some feedback on their experience.
No experience with any tennis sensor, but I’d love to find a sensor that could reliably help me determine when swing changes improve my topspin and/or racquet-head speed.

Reviews of all current sensors vary—no clearly great product.

How are these handle-mounted sensors supposed to determine where the ball strikes the stringbed? Is that realistic? And headspeed at the point of impact, or ball speed? Can that reliably be determined from the bottom of the racquet? I guess the actual speeds don’t have to be accurate, nor the spin rpms, if they at least usefully measure that one stroke is more effective at generating spin or head speed thab another stroke?
 
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