Timex heart rate monitors uses the latest digital FM technology.  Other heart rate monitors use a chest strap to transmit analog signals from a transmitter worn around the chest to a monitor worn on the wrist, but the Timex Ironman Fitness System sends its signals from the chest strap to the watch using clear digital FM signals.  You benefit from increased accuracy due to FM's superior resistance to interference from surrounding sources.

Testing shows the Timex Ironman Triathlon Digital Heart Rate Fitness System to be within three beats-per-minute of an EKG.  This digital technology also allows the Ironman Fitness System to synch the signal from the chest strap to the watch avoiding "cross talk" from other nearby heart rate monitors (like the starting line of a race or a crowded gym).

Competing heart rate monitors send a signal for every heart beat and then rely on the monitor to calculate the actual rate.  Timex heart rate monitors use new "smart sensor" technology to calculate the heart rate from the transmitter and then send a signal to the watch, further increasing accuracy and lengthening battery life (batteries in both the watch and transmitter are replaceable).

Professional triathletes, and multiple Ironman Triathlon champion Scott Tinley, say, " I've tried every heart rate monitor available in the past 20 years.  Some were pretty good for the time.  Still, the old analog technology used to drive me nuts trying to get an accurate reading on a consistent basis.  Now with the Timex digital application, the numbers are clear and correct every time."

Packing all that digital technology doesn't compromise the timekeeping functions or rugged good looks that make the Timex Ironman Triathlon the most popular line of sport watches in the world. In fact, the Ironman Fitness System, available in an entry level and a 50 Lap model, retains that familiar Timex Ironman Triathlon style and a full range of features.

The Ironman Triathlon Digital Heart Rate Fitness System carries that tradition into the next century !!!