Abstract: A system for the automatic zero setting of scales having digital display of the weight is provided so that at tare weight of a bridge mechanism connected to a weighing pan of the scale the display will be as closely equal to zero as possible. Amplifiers and a voltage/frequency transducer are connected to the electrical measuring bridge. A presettable counter connects with the voltage/frequency transducer. The counter is preset so that at tare weight of the bridge mechanism the reading of the scale will be as close to zero as possible. In the path of the information going to the counter a correction unit is arranged. The count provided by the counter is observed by a differentiating unit for detecting deviations of a given magnitude in one direction or the other from a count value which produces a zero indication. The differentiating unit then supplies the correction order and direction of correction to the correction unit.

Abstract: A scale has a display unit for digitally displaying weights, price per unit weight, and price data in sequential fashion and preferably using common digit display portions of the display unit for each of these items of data. A weight computing unit computes weight at automatically repeated periods. A manual entry price unit having a keyboard is provided for the entry of price per unit weight data. A calculator unit is supplied with data from the weight computer unit and manual entry price unit. With this information, the calculator unit computes price data. The manual entry price unit and weight computing unit have a commmon input to the calculator unit. This arrangement together with the provision of a selector unit connected to the weight computing unit and the manual entry price unit allows the passage of price per unit weight and price data sequentially after the weight data has been unchanged during at least two repeated periods.