Descriptions:BMI (Body Mass Index) is a body health index, which is closely related to the total body fat, mainly reflecting overweight and obesity. The world standard for obesity is: normal (BMI ranges from 18.5 to 24.9), overweight (BMI exceeds 25), and obese(BMI exceeds 30 ). China Nutrition Association recommends that Chinese residents' BMI should be range from 20 to 24 for normal, 24 to 28 for overweight, and exceeds 28 for obese.The BMI tape measure is designed to quickly calculate your health index without mathematics process by simply comparing your height and weight values to the compass index, which means your health index. The tape measure is easy to use and convenient, suitable for both young and old!Specifications:Material: plasticColor: whiteMeasure range: up to 150cmSize: about 7*7*2cm/2.75*2.75*0.78inInstructions:1. Rotate the small turntable in the middle of the tape measure to match the height with weight.2. When the height and weight are matched, there will be a BMI figure which is a smiling face, indicating healthy, overweight, obese, and underweight.3. The inside ruler is used to measure the waist circumference.Packing List:1*BMI Tape MeasureNotes: Green = healthy; orange = moderate risk; red = obese (moderately obese) and high risk of heart disease. Men and women have different classifications of obesity risk.