Originally Posted by
tetonrider
it's why if one is going to own multiple meters, they should purchase ones that can be calibrated--whatever brand they choose. accuracy matters here.
In the scenario I laid out, it really doesn't. If your primary meter is calibrated and stable, then doing secondary activities on the other meter isn't going to mess things up much unless it's way off or drifting. You will know that via RPE. I don't need to know if the last ride I did on the rain bike had a TSS of 89.6, as long as it's between 85 and 95 I'm not going to mess up the plan if most of my rides were using the primary meter.
What is much more important to me is stability of the primary meter. If it cuts out intermittently or drifts that can cause havoc with the numbers.