Major Functions Developed with real Bio-Impedance-Analysis Technology for real measurement. Measure volume percentage of general water nutrition, and display it on a LCD screen. High precision measurement. Easy operation and auto- turn-off. Safety operation guaranteed. When not used for a long time, use alcohol to clean analyzer head before use. When used by other persons, always clean the analyzer head before use. An easy way to measure the absorption rate of cosmetics. Strong guidance on manual with detailed illustrations showing the normal reading ranges for several typical positions on our body for easy caring. Specifications READIBILITY : 0.1% TOLERANCE : ¤g1% WATER CONTENT MEASURMENT RANGE : 0 !V 99.9% POWER SUPPLY : 2 X AA OPERATING CURRENT : 2.5 mA NET WEIGHT : 58g SIZE : 170 X 30 X 24 mm (6.75 X 1.2 X 1.0 inch)