I'm looking for a Heart Rate Variability Monitor that's wrist or arm based, and has the option to turn off bluetooth and connect via .a hardwire of some kind.
Bluetooth really scrambles my biofield.
Does anyone know of such a device?
I use an Oura Ring. Just a ring on your finger, not on your wrist or arm though. Only connects using bluetooth when the app is open, otherwise the bluetooth is off and the ring stores up to a few days worth of data within the ring if it has not been synced to the app.