Different Types of Scales

Balance Scale

A balance scale, also known as a doctor’s scale, is most commonly used in a doctor’s office. A balance scale uses a a beam that rests on a fulcrum in the middle, and two sliding standard weights, and the person being weighed as the counter-weight. The known weights of the sliding bars are used to determine the weight of the counter-weight, by sliding the bars until balance is achieved. This method is most often used for more accurate weights, as other methods rely on gravity, and the force of gravity can change the output of the scale.

Spring Scale

A spring scale uses the tension on springs to determine weight. When you step of the scale, the springs are compressed, and gravity takes hold. The scale measures the tension and gives an output in pounds or kilograms. Older style spring scales had dial faces, which were harder to read. Now, digital spring scales are more popular, and give an LED output that is easy to read. Spring scales may not always be accurate; they rely on gravity to give a reading, and gravity changes depending on your location. They are a good choice for in-home, daily weighing.

Body Fat and BMI Scales

Weight isn’t the only thing a weight scale can measure; some offer extra features that help you determine your body mass index (BMI) or body fat to help you live a healthier lifestyle. Those that read out your BMI take into consideration your weight and height that you provide, and then give you a BMI number. A body fat scale uses bioelectrical impedance analysis to determine how much fat is in your body when a small, electrical current is passed through it. Electrical currents pass more slowly through fat tissue, so the analysis takes speed into consideration to tell you what your density is. While not an accurate measurement of weight, it can help you with your fitness goals to lose more weight, and be a motivating factor in burning more fat.