Cateye MSC HR20 Help

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Had this a few years now. Recently it started givien erratic heart rate readings (saying I was at 74bpm, when I knew I was around 144bpm), and despite new batteries in both computer and chest sensor, it now won't read heart rate at all.

Instructions say the sensor can fail, but this has hardly been used. A replacement is around £30. Is there any way I can check for certain if the sensor is U/S ?
 
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