I've used the SwingTool App to measure racquet swing weight on iPad. Here are the photos and videos. http://online-tennis-blog.blogspot.com/2012/01/measuring-swing-weight.html I meassured my strung Wilson BLX Blade 98 and got a value of 325 (Tennis Warehouse states that the swing weigh for this racquet - strung - is 335). Close enough? Also, I did it several times and got very proximate results.