My Garmin chest-strap heart rate monitor became unreliable, and I realised it was because the casing was falling apart; I "fixed" it but that made it totally dead; so after a few weeks without and realising that the Forerunner 55 light-based HR is unreliable for climbing or erging, I decided to buy a new one. Initially I assumed I needed a Garmin one; but "research" said that any Ant or BT one should do; so I risked a Polar. And lo, it connects and works. Here it is.
And here is the old Garmin one.
They are about the same size and weight; the strap design is similar; they both take coin cell batteries. The Polar one was a "Polar H9 Heart Rate Sensor – ANT Plus/Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports", £49. A replacement Garmin one would have been £79 I think.
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