They are only as accurate as the user thgouh. There is a lot of room for error with those. I also have the fat track gold also. It uses a 3 site test, at chest stomach and thigh. They are somewhat accurate, Ebay is the place to get it. I bought mine new in package for $11 retails for about $28. I like the digital hand held Omron, it is a little more consistent and accurate. Got mine sealed and new in package for $22.