Primusweb has an article about why your scale is dangerous and misleading.

This brings us to the scale’s sneakiest attribute. It doesn’t just weigh fat. It weighs muscle, bone, water, internal organs and all. When you lose “weight,” that doesn’t necessarily mean that you’ve lost fat. In fact, the scale has no way of telling you what you’ve lost (or gained). Losing muscle is nothing to celebrate. Muscle is a metabolically active tissue. The more muscle you have the more calories your body burns, even when you’re just sitting around.

Here’s a visual example of how the scale lies to you. Here is one before/after bodychanger and another. Each person technically ‘gained’ pounds in their fitness journey. However both of their ‘after’ pictures show much healthier, slimmer, people. Pounds don’t count, body fat percentages do!

How do you check your body fat percentages, and what is healthful?

This article takes a look at different scales that offer you body fat results, however a cheap pair of body fat calipers are considered just as good, and since they get you away from the scale, maybe even better.