High Precision Strain Gauge Sensor System 6MM Tempered glass 280 x 280 mm. LCD Display Size: 75 x 30 mm Please remove the plastic Cover under the Battery to start the Weighing Scale. Please Use the Scale on Flat Hard Surface and do not move the scale in the switched on position, Scale can show the difference of Approximately 3-5 Kgs in weight for the first time only when you move the scale in the switched on position . Depending upon your standing style the Scale can showing a difference up to 300-500 gms. Therefore, please do not move the scale in switched on position