The founding partner was Bernardo Castellaro, a Genoese who, since boyhood in the 60s, had obtained basic experience in the factory in Pegli, in the field of marine instrumentation (construction of pressure gauges, thermometers, thermocouples, etc.).

Right from the start, Master's target sector was extensive: general marine instrumentation for all types of watercraft, which developed into its primary sector until 1984 thanks to the untiring efforts of Castellaro, who gathered knowledge and experience, and forged relationships with marine yards and port facilities throughout Italy. 

During that latter period, as a consequence of a general recession in maritime traffic with serious declines in the marine construction industry, Master turned progressively to new industrial applications in diverse productive sectors.       

The experience obtained in the marine sector where the quality of products had already been a strength, become important  and commercial organization based on discriminating service (the main features being: presence, quality and scheduling) was met with positive acclaim among the new industrial customers.  

In the course of a few years, Master continued to reaffirm itself with increasingly satisfactory results in the industrial panorama of the Northwest and launched the first collaborative efforts with enterprises in South Italy.  

Its principal customers in the industrial sector included ANSALDO, ITALIMPIANTI, ABB offering the opportunity to meet the challenges in important projects in which from time to time cutting-edge technological solutions were acquired and implemented.  

Since 1986 Master has specialized in the more specific sector of thermocouples and thermoresistors (abandoning other instrumentation) and thus becoming a national leader in instruments for temperature measurement.  

A high technical level is achieved through the training of a highly qualified staff, through a meticulous research and experimentation activity as well as the ongoing participation in study courses and continuing education relating to the technology of the sector. 

With this focus on research and development, several collaborative university projects with the Istituto Macchine of the College of Engineering, Genoa (Prof. Pittaluga, Prof. Acton and Prof. Trucco) were begun.  Projects relating to miniaturization of the thermoelements were developed and completed, in order to meet the requirements of an industrial market which demands components of ever-decreasing size.  

Recently, Master has distinguished itself from its competitors by offering solutions and products tailor-made to the specific requirements of the customer.  

In 1988 an important collaboration was started with Piaggio Aeroindustries that resulted in a project relating to a new type of sensor for determining the temperature of a wing section for aeronautical models in design at the time.  

These sensors were approved by the US aeronautical register and even today continue to be serially manufactured at the current Master division of Westeam.  

Also in 1988 the company's headquarters were transferred to via Muratori in order to alleviate the space requirements resulting from the increase in business. 

Since then, Master's activities have been the subject of constant investment mainly in perfecting production technology and the laboratory facilities used for the various product quality test inspections. 

In 1996 the enterprise received its first  ISO 9000 certification.