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A comment on The Apple Watch – Tipping Point Time for Healthcare. Parent comment

Re:The Apple Watch – Tipping Point Time for Healthcare by lz400 on Wednesday September 26, 2018 @09:49PM (#18081618)
Couldn't they be connected wirelessly and send the electric signal they receive digitized?
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Re:The Apple Watch – Tipping Point Time for Healthcare by JshWright on Wednesday September 26, 2018 @10:25PM (#18081714)
It works by comparing the voltage potential across two or more points (in the case of the watch it's comparing the right arm against the left)
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