Buyers should be cautious about buying this product. The documentation is horrible, and the clips that hold the Powermeter around your golf shaft look like they will break with time -- we'll see. The Powermeter appears to work by measureing the centrifical force generated at the club grip. So you can get higher speeds depending on where the Powermeter is placed. However, the swing speed appears close to the figures I have seen in a golf shops, and the Powermeter is an inexpensive tool that can be used to measure swing speed over time. 2 stars

This was a waste of money. The instructions were poorly written. The device itself kept switching numbers so that I could not set it properly. I do not recommend it. 2 stars

AWESOME AND ACCURATE METER FOR THE PRICE. I RECOMMEND IT TO CLUBMAKERS ALL OVER TO PROPERLY MEASURE SWING SPEEDS. 5 stars