The phrase "rate tracker" refers to a tool or feature that helps keep track of or monitor changes in interest rates or prices over time. Full definition
Right off the bat, it should be noted that a heart rate tracker on your wrist isn't going to be as accurate as one that you can wear around your chest. (androidauthority.com)
This free mortgage rate tracker gives you an instant report card on your home loan choices, with specific recommendations on how to get better results than what you're currently paying. (refiadvisor.com)
In this case a heart rate tracker with a screen that can show your readings would be of benefit. (fitnesscrest.com)