Heart Monitor

I bought a heart monitor a couple of years ago. I thought it was just one to wear on my wrist like a watch. When I got it there was a contraption to go around my midsection/ribs. I got used to it, but the metal pieces on it cut into my skin so I stopped wearing it. Now the battery is dying & I'm looking at getting a new one. Looking for recommendations for ones that just fit around the wrist or upper arm. Thanks!