Bodyfat Measurement Tools

Just wondering what you guys think about bodyfat measuring tools. I was considering investing in one and don’t know what would be better, a scale or callipers. I have been reading a few different websites, but its hard to find non biased sites. Most reviews I have found are from the companies selling them. I figured this would be a good area to get some feedback.

So do you guys think the scales or callipers are better or do you think both are a waste of money? BTW I do have a tape measure, but wanted another form of logging my progress and watching my fat level as I attempt to bulk more.

Thanks for the help!

Two good articles for you:

http://www.t-nation.com/findArticle.do?article=208comp

http://www.t-nation.com/findArticle.do?article=209body

Thanks a lot! I should have searched before posting. Bleh.