If, for max heart rate, they use the common formula 220-Age, you could try entering 120 as your age. 1% would equal 1 bpm. Hopefully the monitor can display above 100%.
Or enter 20 as your age (making max BPM = 200), and double the percentage to get your true BPM. 50% = 100BPM.[/quote]
While your creativity is laudable, why doesn’t the OP get a clue and just by a monitor that does what he wants it to do?
I make a nice wage, but like a good adult, I save up and budget for the things I want. And when I buy something, it does what I want it to when I buy it. If this means I need to save for an extra week or month to have a product do what I want it to do for several years, well… it doesn’t take an IQ of 140 to determine what is the rational choice.