Use steps
Step 1: fat caliper claws, then press "zero" (the reset button) cleared.
Step 2: where the skin folds are measured. (about one inch on the right hip)
Step 3: standing, with your thumb and index finger firmly pinching the skin fold, continue to left-handed pinch the skin fold, put the electronic fat caliper claws in the above measurement.
Step 4: press and hold the jaw until you feel a slight pain. Then press the "HOLD" key to keep the measurement data. After reading the measured value, press the "HOLD" key to continue the previous step. Repeat three times, take the average value of the reading. Corresponding body fat control table, determine your body fat percentage, see if it is in line with the standard.

Product specifications:
1 measurement range 0-50mm
2 resolution 0.1mm/0.01"
3 allow the error of + 0.2mm
4 using temperature: 0 degrees C - +40
5 storage temperature: -20 degrees C - +70
6 battery: 3V button battery

 Product information:

Applicable parts: waist
Function: wireless remote control
Power supply mode: rechargeable
Control method: mechanical
Massage technique: kneading

Size Information:

30*18*5CM

Packing list: 

1*massage +1*USB cable

Product information:
Power type: Rechargeable
Color: White
Specifications: 1 Drag 2
Charging Interface: USB
Material: Plastic