True Fitness Excel Series Owner's Manual page 18

Contact Heart Rate
: B O
CHAPTER ONE ASIC PERATION
A Note on CHR Accuracy
CHR monitoring may be a bit less accurate than a
chest strap, since the heart rate signals are much
stronger at the chest.
About 5% of the population cannot be picked up
by any CHR system. This is because their heart is
positioned in a more up-and-down manner in their
chest, as opposed to leaning over to one side.
E S O ' G
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X C E L E R I E S W N E R S U I D E