Spookily, my HRM stopped working this morning - changed the battery (losing two screws in the process) but is das kaput. Have ordered the Halfords one you linked. Will let you know how it goes.
Did 30mins on stationary bike earlier with the Halfords HRM:
This a similar effort last Thurs with the Garmin HRM:
Even though the y-axes scales aren't exactly the same, it's pretty apparent that the Halfords HRM was more than a little sporadic. Not sure whether it was a lack of moisture on the electrodes (I always use a gel) or I've developed a crazy arrhythmia in the last few days!
If similar happens tomorrow, it's going to the vultures on eBay.
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https://www.halfords.com/cycling/cycling-technology/fitness-trackers-heart-rate-monitors/halfords-heart-rate-monitor-chest-strap?istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istFeedId=367c5610-f937-4c81-8609-f84582324cd6&istItemId=wrtpqlrrm&istBid=t&_$ja=tsid:94971|cid:868641105|agid:42483200063|tid:pla-423298513579|crid:203456298921|nw:g|rnd:2979156544873460063|dvc:m|adp:1o5|mt:|loc:9045417&gclid=CjwKCAjw0vTtBRBREiwA3URt7pbbL3fuxgYmfgZ5gi9W2tv1bwcBfSSPm6pOwhQtWOtv60JseaoNfhoCaEAQAvD_BwE