Skin fold measurements is a way to estimate your body's fat composition. I prefer this method compared to the rest as it is easily available, simple, inexpensive, relatively accurate and not painful.
The Skinfold caliper is needed to carry out the measurements.
The Skin fold caliper is a device which measures the thickness of a fold of your skin with its underlying layer of fat. By doing this at the key locations can be a quite accurate representative of the total amount of fat that is on your body, it is also possible to estimate the total percent of bodyfat on your body.
Areas to test out: Triceps, biceps, shoulder blades and waist: