Believe it or not, I just can't seem to find the caliper anywhere here.

I have something like this http://www.bodybuilding.com/store/om/fat.html which showed my bodyfat to be 18%. The weight was however the same as per the other readings. What should I do? :S

P.S: Getting it done at a health centre isn't an option because I can't go there every week. The gym that I go to doesn't provide that service.