The scale is not only the symbol of justice, but also the embodiment of trade. Next to the clock (chronometer) it is the most important measuring device.

Already in the antique age the scale was used to determine quantities of goods. Especially quantities which could not be determined by counting and measuring. The Romans improved this system by suspending the center of the beam on a pin. The first constructions with unequal lengths of the beam and sliding weights have also been invented by the Romans.

The first scale was already developed about 5000 BC in Egypt. It was a supported symmetric beam on both ends of which scales were hanging.

During the Renaissance when money became important, the first coin scales were used. A greater precision was then already required.

Also Leonardo da Vinci already studied the problem of determining weight. Based on his ingenious thinking and numerous trials with suspended weights many interesting constructions as for example the inclination scale were invented.

During the 18th century precision was increased. The increment was improved and scales with short beams reduced weighing time considerably. The sensitive mechanic system was integrated in a wooden housing which protected against dust, corrosion and current of air. Optical devices and additional illumination made the reading of the result much easier.

But only during the 20th century the essential elements became more sophisticated.

About 1911 people began to integrate the weight pieces which had so far been put on the scales into the scale.

After the second world war the weighing technology was subject to a very fast development. Increased quality requirements of the goods, legal regulations and shorter production times were important impulses for a technology which was more precise, faster, simpler, more reliable and more economic.

This development was completed during the sixties by the forthcoming electronic. Thanks to digital technology and the increasing densitiy of integration of complex connection circuits, it became possible to manufacture electronic scales in large numbers.

The official member of  the Iranian Weighing & Measurement System Association

The License of Institute of Standard & Industrial Research of Iran