Thank you for choosing the Escali ECO180 Solar Powered Bamboo Bathroom Scale. This precision state-of-the-art measuring instrument is most accurate when weighing on a flat hard surface. This scale will not function correctly on carpet. As the electronic sensors are sensitive, avoid dropping or jarring the scale and store where it will be protected from impact. Operating instructions 1. Make sure your scale is exposed to either outdoor (sun) light or interior lighting.