Can I use an external heart rate monitor with Milo?
Milo works with most Bluetooth heart rate monitors, including chest straps and armbands.
How to pair your sensor
Put your heart rate monitor on and make sure it is discoverable.
On your Apple Watch, go to the workout start screen and tap Settings.
Tap Sensors.
Tap Search for sensors and choose your device from the list.
After the first pairing, your watch will connect to the sensor automatically whenever it is active and nearby.