True CS 1.0 Owner's Manual page 13

CHR
chapter one: basic operations
The CHR system lets you monitor your heart rate without wearing a
Contact
strap.
Heart Rate
(CHR)
Gently grasp the contact heart rate pads as shown below.
When the system detects your hands, the Heart Rate label will start
flashing in time with your heart beat. During this time, the system is
analyzing and locking in your heart rate. Within about 15 seconds,
your digital heart rate in beats per minute should be displayed.
Important: The CHR System should only be used while walking
at speeds of 4 mph or lower. Above this speed the CHR accuracy is
unavoidably unreliable due to large muscle movements.
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CS1.0 Treadmill Owner's Guide