Specification: Condition:100% Brand New Item Type: Fat Caliper Scope of Application: Measuring head circumference, waist circumference, hip circumference, leg circumference, arm circumference. BMI (Body Mass Index) is the body health index, which is closely related to the total body fat and mainly reflects the body's overweight and obesity. The world standard for obesity is: BMI is within the normal range from 18.5 to 24.9, BMI greater than 25 is overweight, and BMI greater than 30 is obesity. The BMI health ruler is able to quickly calculate your body health index, saving the complicated mathematical calculation process, just correspond your height and weight values according to the compass library instructions, and the arrowhead points to your health index value. The operation is simple and convenient, suitable for all ages! Instructions: 1. The small turntable in the middle of the rotating tape measure matches the weight according to the individual's height; 2. When the height matches the weight, the BMI will aim at a value, which is the mouth of the face BMI aims at HEALTHY means health; Aiming at OVERWEIGHT means overweight; Aligning to OBESE means fat; Aim at VERY OBESE to indicate excessive obesity; Aim at UNDER WEIGHT means thin. 3. The ruler inside is used to measure waist circumference Package List: 1 x Fat Clip 1 x BMI Tape Measure 1 x Waist Tape Measure 1 x Fat Clip Instructions Note: The standard on the ruler is just for reference, and the specific judgment shall be based on the standard established by the corresponding country. It is normal for the waist measurement to have a value other than "1", because when measuring the waist, the arc of the shell is also part of the waist.