I have just bought a new HR monitor to use on my Wattbike and Zwift. Tonight I have used it for the first time. My problem is the HR reading on the Wattbike is correct, while the HR when paired with Zwift fluctuates and is around 30 BPM lower than expected.
The HR monitor is a Polar T31 coded and I pair from the Wattbike via bluetooth on a MacBook Pro.
Many thanks for your help.