Changing the fingers absolutely changes the readings on a pulse oximeter. They also take at least 30 seconds to settle down. (At least mine do.) I use 3 at a ti

Changing the fingers absolutely changes the readings on a pulse oximeter. They also take at least 30 seconds to settle down. (At least mine do.) I use 3 at a time in the mornings when I check my vitals and when they read within 1% (e.g., 97%, 98%, 98%) I record the lowest reading.