My big corperate gym has a type of hand held that you grip and it tells you your percentage. It was spot on for me and my friends. I still don't know how it could tell just by my heart rate of something. The only PROVEN is calipers IMO.

Also, if you are trying to gain muscle mass then this whole topic should be a distant afterthought in your head. It's pretty much one or the other in regards to faster noticible results. For instance, you could be gaining muscle with your dietary intake and everything is running smooth, but if you start worrying about fat accumulation then you'll sacrifice some gains.

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