Electronic scale and method for controlling electronic scale

An electronic scale, comprising:

• a shell with a loading surface;
• a weighting sensor disposed in the shell, wherein the weighting sensor generates a weight signal according to an external force applied on the loading surface;
• a controller disposed in the shell and electrically connecting to the weighting sensor for receiving the weight signal;
• and
• a prompting device electrically connecting to the controller, wherein the prompting device comprises a plurality of light-emitting element arranged in a route on the shell, and the controller drives the plurality of light-emitting element of the prompting device to generate a first color light sequentially with a switching frequency along the route until the external force detected by the weight sensor reaches a first weight.