Kudos to Cateye Astrale 8 for most bang for the buck as well as great reliability!
However, if you like HR included, I have had 100% success with the Polar CS200.
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-\Brian
18' Landshark Tandem - Custom
15' Wabi Special Single-Speed Road
06' Cannondale Six13 TeamOne
06' Cannondale Prophet 3 "Lefty"
92' Trek 5200