If you feel that the P3pro's reading of your swing speed is too low(even if it's just 5% off), resulting in a shorter distant compared to real life, then please post when you bought it and whether it's serial or USB.

I'm trying to figure out whether this problem affects all or just some P3pro sensors. New or old etc....

Mine is a 2005 serial and the swing speed was about 15-18% too low.

Thanks,

Btw, PM me if you're interested in the fix for the distance.