1) Children and adolescents under 18 years old. Persons under 18 years old ingest relatively higher nutrition and develop relatively fast and at present there is no standard evaluation system for components of the bodies in persons under 18 years old, therefore, some of measurement indicators vary according to different ages in our system.
| Indicator type | Effective age |
| Body Weight | Effective at any age |
| BMI (Body Mass Index) | ≥ 4 Years old |
| Body fat percentage | ≥ 10 years old |
| Body water percentage | ≥ 10 years old |
| Subcutaneous fat | ≥ 10 years old |
| Basal metabolic rate | ≥ 10 years old |
| Fat free mass | ≥ 10 years old |
| Visceral fat grade | ≥ 18 years old |
| Skeletal muscle percentage | ≥ 18 years old |
| Muscle Mass | ≥ 18 Years old |
| Bone mass | ≥ 18 years old |
| Protein | ≥ 18 years old |
| Metabolic age | ≥ 18 years old |
| Physical Age | ≥ 18 years old |
| Health score | ≥ 18 years old |
2) A Pregnant Woman: Her body has fetus (or fetuses) and amniotic fluid, and in detection process these uncertain factors will affect accurate values of body data, therefore, fat percentage and other data cannot be used as reference and it is suggested to measure only weight.
3) A professional bodybuilder:Target population of this product is general population. Since professional bodybuilders body muscle percentage and fat percentage belong to special percentages, therefore, fat percentage data measured by this product may be different from those measured by a specialised instrument or equipment for use in a hospital and it is suggested that such population pay attention to long-term change in data, rather than measurement value itself.