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Old Series 0 for sleep monitoring/wake up alarm (it has a a scratched front so wasn't worth selling), Series 2 for everything else when awake.
 
Good thread. I am going to get an S3 soon, and was going to keep my S0 just for gardening and the like. I hadn’t thought of using it for sleep monitoring, but being able to do that while my primary watch is charging overnight would be really useful. Thanks!
 
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