I decided to test these watches’ heart rate sensors in the context of a run. An Apple Watch on one wrist, a Garmin Fenix 6 Pro Solar on the other, and a Wahoo Tickr HR strap around the chest Garmin Support Center. Contents. Expand fenix 7S Solar; fenix 7S Pro; fenix 7 Standard; fenix 7 Solar; Recording a Critical Swim Speed Test; But it's not a crazy amount. Another minor difference is that the new FR 965 has a titanium bezel, which makes it a smidge more durable and sharper-looking—an appropriate upgrade for framing an AMOLED screen. The price difference is not huge. The Forerunner 955 standard is $499.99 while the FR 955 Solar and 965 are both $599.99. Garmin Fenix 7 Pro: in the field. I tested the smallest version of the watch, the Fenix 7S Pro, wearing it on one wrist and the regular Fenix 7S on the other. When it comes to battery life, Garmin estimates that the Fenix 7 Pro will last up to 18 days in smartwatch mode (22 days with solar), and up to 57 hours in GPS mode (73 hours with solar). Garmin's fenix 7 Pro Solar multisport watch is designed to perform all day, every day. Weeks of battery life from the Power Glass solar-charging lens and advanced training features ensure you can meet any challenge. Hill score measures your climbing performance over time, while real-time stamina updates help you gauge your current potential. BGgJZ.