"Healthgenie Digital Weight machine for Body weight HD-221 ( Sporty Red LCD weighing scale) can be used as bathroom weighing scale. Tempered glass having anti-skid platform on jet toughened glass surface with round edges for added safety. Low Battery & over load indicator, Auto switch off, Auto Zero are few of its best automatic features. It has an option to measure weight in Kg/LB (Press button given at the back side to switch). It operates with 2 AAA Alkline batteries (included). One can measure a weight of minimum 5kg & maximum 180kg, with a maximum variation of just 50gm. To calibrate the weighing scale, place the weighing scale on hard, flat surface and initialize by pressing one foot on the platform until random numbers displays , remove foot as it returns to zero (0.0), now start to measure your weight. It is suggested to always ignore the first reading for calibration for best accuracy. The best time to measure body weight is morning, as weight tends to fluctuate throughout the day as per food and liquid intake. "