Chronograph Recommendation

[bslugnut]

Has anyone used a bow attached chronograph, such as the Radarchron Arrowspeed Chronograph from Cabela"™s http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0014274415221a&type=product&cm Cat=search&returnPage=search-results1.jsp&QueryText=chronograph&N=4887& amp;Ntk=Products&Ntx=mode+matchall&Nty=1&a mp;Ntt=chronograph&noImage=0
or one of a similar make? How accurate are they? Are they as good as the freestanding models?

I am also looking for a good digital archery scale to weigh my arrows and components. Any recommendations would be appreciated.

Thanks,
BSLugnut

[Finch]

A friend of mine (Springcaller) has that exact same one, I believe. I have chrono'd my bow before on a free standing chrono and they were both the same.