To be accurate there aren't many ways. The electrical method tends to be reliable for measuring a change, but not your actual % (a very skinny friend of mine was told his was -1%!). You have to dial in things about your "body shape" and "fitness level" that make it pretty dodgy.
Skin calipers are supposed to be better, but different methods and different people doing the measurement may cause bias in the results. Try to get someone experienced who measures at 7 different points (and knows where the points are!). You usually end up with a load of marks on you (from a pen where they've measured distances to see where to put the calipers) if it's done properly.
I think the best way (but not very practical) is the total-body-submersion method. I've not tried this, but apparently it involves getting on scales whilst in a tank of water. It's supposed to be within 1-2% of your actual figure.
So I'd go for calipers if you want an accurate reading, or scales if you just want to see yourself improving.
Good luck!
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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