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Be Careful ! Not for the Forerunner 305 !!
The listing for this product is misleading. It states that it is for the Forerunner 305 and the Edge 305, however, it won't work with the Forerunner 305. If you look more closely, this is stated in the technical details description for the product. I orderd this as a replacement for the monitor that came with my Forerunner and it absolutely will not work.

Precise, but lasted less than 2 years
Changed the batteries, followed the instructions of a Garmin technician, but had to buy a new one. Hope this lasts longer.

Doesn't work for me either, and poor customer support.
It was erratic. I tried with the gell and different positions (on the back etc.) as recommended in the trouble shooter guide. I contacted customer support and they said "sorry, it doesn't work for everyone." That was not the most helpful reply I have ever gotten.

I am considerably overweight and have a heart condition. That's why I was willing to put up the bucks to help make my training as safe and as effective as possible. It probably has trouble detecting through the fat layer so I am in a catch 22, it won't work till I lose the fat but it is harder to loose weight with out the heart rate monitor.

Gah!!!

Fortunately the $55 finger on the buttons sensor works like a champ so I have something but I have no choice but to send the 305 with useless monitor back to Amazon.

Works fine
Bought this to replace the original one that came with the unit that I lost somewhere. Works fine, doesn't miss a beat.

Doesn't Work
Mine has never worked. I asked Garmin for a replacement and they ignored me.