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Snagged my wife a Mio Alpha strapless heart rate watch that shines green LED's into your wrist and monitors blood flow through your capillaries.  It works great, in fact it is quite accurate and can run constantly for long periods of exercise!  The down side is it is bluetooth 4.0 which is a major issue with Android, even 4.2.2...  It seems Google is waiting for a future release till they build in 4.0/bluetooth low energy (BLE)...  Samsung has added their own "4.0" on newer handsets like my wife's Galaxy Note 2 which I was able to connect via a test app but there is no development in the Play store since it is not native to the Android OS...  Bummer, but here's hoping to full bluetooth 4.0(BLE) in Key Lime Pie 5.0...
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Ryan Matthews's profile photoRay Maker's profile photo
 
Would this work on the S3?
 
I don't see why not, the Note 2 and S3 were released basically at the same time and have what seems the same bluetooth 4.0 compatibility provided by Samsung.  I have to warn you though, this test app is just that, it shows your BPM live after a quick pair to the Alpha but there is no logging or further support of data consumption... 
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