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Old 12-12-2012, 05:58 AM   #4
v-verb
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Join Date: Nov 2012
Location: Toronto
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Have you guys seen this app for IPhone/IPod?

http://www.tennisservespeed.com/best...dti5pm3i6liupp

No guarantees it works but it's only a couple of $$

I use their string tension app.
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