Need Heart Rate Monitor - PLEASE HELP

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I am going to be investing in a Heart Rate Monitor so I can maximize my results and get true results on my Calories burned. Does anyone have any suggestions on which are the best?
I am not looking to spend massive amounts of money. There are some out there for under $30 on Amazon.com and that is ideal. I have found one I might like, please check the link below and let me know if you think this is a good buy. Or suggestions. Thank you

http://www.amazon.com/gp/product/B004GYUHFY/ref=ox_sc_act_title_1?ie=UTF8&m=AS9UUXZ8KC49B

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