BMI is a ratio of a person's weight to height. BMI is commonly used to classify weight as "healthy" or "unhealthy".

For most people, BMI provides a good measure of obesity. However, BMI does not provide actual information on body composition (i. e. the proportions of muscle, bone, fat and other tissues that make up a person's total body weight).

a) For an adult:
BMI values between 18.5 and 24.9 are considered "normal" or "healthy" weight. BMI values between 25 and 29.9 are considered "overweight" and 30 and above are considered "obese." BMIs above 25 are unhealthy and have been shown to increase the risk of certain chronic diseases. BMIs under 18.5 are considered "underweight."

You've got around 650 muscles in your body, and they make up roughly half of your bodyweight. These muscles can be divided into three different groups: skeletal, smooth and cardiac. All of these muscles can stretch and contract, but they perform very different functions.
Skeletal muscle: Produces movement, maintains posture, stabilizes joints and generates heat
Smooth muscle: Found in the walls of hollow organs
Cardiac muscle: Exists only in your heart
Skeletal muscle: The tissue most commonly thought of as muscle is skeletal muscle. Skeletal muscles cover your skeleton, giving your body its shape. They are attached to your skeleton by strong, springy tendons or are directly connected to rough patches of bone. Skeletal muscles are under voluntary control, which means you consciously control what they do. Just about all body movement, from walking to nodding your head, is caused by skeletal muscle contraction. Your skeletal muscles function almost continuously to maintain your posture, making one tiny adjustment after another to keep your body upright. Skeletal muscle is also important for holding your bones in the correct position and prevents your joints from dislocating. Some skeletal muscles in your face are directly attached to your skin. The slightest contraction of one of these muscles changes your facial expression. Skeletal muscle generates heat as a by-product of muscle activity. This heat is vital for maintaining your normal body temperature.
Skeletal muscle represents approximately 30% of body weight of a healthy 58kg woman or 40% of a 70kg man.

This is important for monitoring and maintaining healthy bones through exercise and calcium-rich diet.
An adult skeleton is made up of 206 bones, which come in several different shapes and sizes and have specific structure.
Your bones contain blood vessels, nerve cells and living bones cells known as osteocytes. These are held together by a framework of hard, non-living material containing calcium and phosphorous. A thin membrane called the periosteum covers the surface of your bones.
Bone Mineral Content differs according to age and sex.

Fat mass is the total weight of fat mass in the body.

Fat-free mass is comprised of the nonfat components of the human body. Skeletal muscle, bone and water are all examples of fat-free mass. Fat-free mass can refer to any body tissue that does not contain fat.

Body fat scales give a more detailed picture of your body composition than simple weighing scales. They let you know if your body weight is made up of lean muscle or of fat. They allow you to understand whether your diet or sports routine is leading to a loss of water or if you are actually burning fat? (High levels of body fat are a contributing cause of many serious illnesses, including heart-disease, diabetes, and certain cancers.)

The 2 main reasons for keeping track of your body water levels are: 1) To find out if you are sufficiently "hydrated" - your body needs a certain percentage of water to function properly (heat regulation, bringing nutrients to cells, cushioning vital organs, etc) - see instructions for more info.
2) To differentiate loss of water from loss of fat while dieting.

We recommend always using the same scales in the same conditions, once or twice a week. Estimate yourself in the morning, preferably naked, when you are rested, not dehydrated and you have been to the bathroom.

Body fat and Body water results are indicated as a percentage of total body weight. A results evaluation bar on indicates where the user's body fat level is situated compared to the medically recommended values. (A reasonable range of percentage body fat for the adult male is between 14 and 26%; that for the adult female is between 20 and 33%.)

In certain cases, the method of body fat estimation that we use (BIA method) can overestimate body fat in adult, elite athletes. This is due to physiological differences, such as muscle density.
If you are over 18, have been consistently training at least 3 times a week for at least 2 hours each time for a long period in a sport which involves a sustained cardio-vascular effort, then use the athlete mode for optimum accuracy.

You cannot use a body fat product - as a general rule you should avoid all sources of electronic interference.

We do not recommend that you use this product. The results will be highly falsified because pregnancy changes the water levels in your body (we estimate body water in estimating body fat). If you have used the product, there is no need to worry but avoid using it again until after the birth. You can however use the weight-only feature of your product by stepping directly onto the platform.

If your coil contains copper, then it's possible that the result will be slightly falsified because the copper will effect the estimation. However, there is absolutely NO RISK to the effectiveness of the contraceptive or to your health.

Initial zero is too large. Check if the platform is empty. If not, please remove the weight off the platform.

Overload warning. Remove the weight immediately; otherwise, permanent damage to the scale will occur.

Contact error. Impedance cannot be measured. Please make sure that you are standing still on the scale and maintain maximum contact between your feet and the metal contacts. Please refer to Section ˇ§Operationˇ¨. You may need to moisten your feet to improve the electrical contact.

Estimated body fat percentage is beyond the technical limit. Moisten your feet may help to improve the electrical contact.

Percentage total body water is out of range. Moisten your feet may help to improve the electrical contact.

Machine error. Please contact your sales representative.