best heart rate monitor watch??

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Hi MFP community! I am in search for a great rate monitor watch that is pretty accurate. There are so many out there I'm so undesicive :( I need one because I can't seem to be reaching my goal and I eat pretty clean in between 1200 to 1500 cals. I am also on keto right now. So I may be not burning much at the gym? I do work out almost two hours. Anyway is there a watch y'all recommend or I should stay away from? Thank you all for your time!!!