I was thinking along those lines of "What other use can there be?", but then I came across Altservices explanation.....</p>
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"Many archers will only use their speed meters for measuring the speed of their arrows either just out of interest or for use with a computer program such as Archers Advantage, which can give them a full set of sight marks easily.</font></p>
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Used properly it can also be used for detecting rogue arrows or also as part of your training program.</font></p>
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If you repeatedly shoot a full set of arrows through the machine logging the results for each arrow you will find that any rouge arrows will consistently record a different speed. These can then be singled out and checked later on the range.</font></p>
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Also, you will find, especially for a recurve archer (although it works just as well for compound) regular shooting through the machine, trying to get consistent speeds will show up problems in release and draw length, This can all be done at short range in the back garden or even in the garage with the right lighting kit."</font></p>
<font face="verdana,arial,helvetica,sans-serif">...So it got me thinking maybe it can be of some other use!?!?!?</font></p>