All scales used for selling to the consumer by weight need to be legal for trade scales. These types of scales are called retail scales. If you own a deli, candy store, butchers or grocers all scales used to sell off need to be trade approved.
Scalesmart's shop scales come with two displays so that the customer can see the value and weight of the item that they are purchasing. Retail scales from Scalesmart come with a full 12 month return to base warranty.