This is the hand-held monitor that creates a quantified profile of your skin, the key to developing an individualized skincare program. It uses Bio-Impedance Analysis (BIA), a painless electrical impulse--the same proven method used to measure body mass--to detect oil, water, and dead skin cell levels on your face. Simply touch the tip of the wand to your cheek, forehead, or chin and hold for 10 seconds. Readings are displayed graphically on the device's LCD screen and, with the included reference chart, help you determine the appropriate beauty products, cleaning methods, and diet that will help keep your skin healthy. It is also useful for evaluating the effectiveness of skincare products and how seasonal changes affect your skin. Includes two LR44 batteries that provide approximately 1,000 readings. 4 1/2" L " x 1/2" Diameter (1 oz.)