I've read that if you are very overweight then the accumeasure caliper would not give accurate results. Has anybody used this caliper? Would I be able to use it succesfully? I am male and weigh 265 lbs. and am 5' 9". I am trying to follow the Tom Venuto "Burn the fat, build the muscle" book and he recommends measuring and tracking your body fat every week. Thanks in advance.