The term portable scales is used to describe scales that can be run on batteries and do not depend on a mains connection. In theory all weighing scales are portable, if you can pick it up and carry it then it is portable, but you may not have a mains socket where you need to use the scale, so a truly portable scale is battery powered.There are two forms of battery powered portable scales, ones that use standard dry-cell batteries and those that have internal rechargeable batteries.
Portable scales such as gram scales are commonly used for food weighing due to their ease of use and overall versatility. Gram scales refer to the act of measuring the weight of products in gram increments. They can be used for a series of food weighing applications including portion control, calorie counting and, for commercial environments, the weighing of food products to be sold.