1905: the Porro sons start their craft activities in the field of weighing, with particular regard to the retail sector, where acting as the Italian dealers of Macchi they carry out repair services and assistance to enterprises and shops in the province of Milan.
1974: after work experience in major companies in the weighing sector (Bulgari Pese, Toledo) the two partners decide to form the company Societ Bilanciai Milanesi (SBM) to work with sales, installation and repair of industrial weighing instruments of high capacity.
1980: two former employees of the company Bulgari Pese acquire the business and start-up of Porro brothers' company and simultaneously decide to merge the company with SBM, thus giving birth to the definitive corporate structure of SBM - Societ Bilanciai Porro s.n.c. headquartered in Milan.
1981 : the new company quickly expands its market share, gaining important new customers by implementing new technologies in electronic weighing.
The agency contract with Buroni Opessi, then absorbed by the GEC Avery Berkel group, gives new impetus to the sector of industrial weighing.
1982: the company is transferred to the new location in Paderno Dugnano, located in Milan hinterland. The new structure allows for a consolidation of production activities with services and repairs on site.
1989: the company moves again, to the present site of Palazzolo Milanese, a few km from the previous site. The new location allows more than 1,500 square meters of production space.
1994: with remarkable foresight, the company decided to obtain certification of its quality system according to ISO9002, reaching results at the end of the year and maintained until 2002. This marks the beginning of a new way of working.
1999: the "quality culture", now widespread in most Italian companies, is supported by an adequate supply of ancillary services. This includes the recognition of the quality assurance of the production for the CE certification of products and the start of the process for SIT accreditation of its Metrology Laboratory for masses and scales.
2001: the company is transformed into an SRL (an Italian limited liability company format) to respond to the changing direction and better adapt to the trends of the young and dynamic management.
2002: the company makes the natural migration to the new standard ISO 9001: 2000 also implementing the phase of design within its quality system, partly as a result of increased importance to production. 2003: Metrology Laboratory extends its SIT accreditation and is also enabled by the Milan Chamber of Commerce for the execution of periodic checks of metric tools nationwide.
2005 : the calibration laboratory again extends its SIT accreditation, coming to offer services of calibration of the masses from 1 mg up to 2000 kg and weighing 10 g up to 100,000 kg, positioning itself as a point of reference for the industry.
2006 : the calibration laboratory Centro SIT 134 updates its quality assurance system to the new ISO IEC 17025: 2005 standard for all laboratory testing and calibration.
2009 : the company moves to the new standard ISO 9001: 2008. The new management team brings new momentum to the development of the commercial setting, laying the foundations for a gradual expansion of high-power production tools.
2010 : the owners decide to equip the production site with renewable energy sources. Removing ethernit covers, a new photovoltaic plant capable of producing up to 35kW is built.
2011 : following the establishment of Italy's Single Accreditation Authority ACCREDIA Italian laboratories accredited to perform calibration with effect from 1 July 2011 no longer use the logo SIT but the new mark ACCREDIA. The Metrology Laboratory, identified with the previous Accreditation as SIT Centre 134, is now identified as Calibration Centre LAT 134.
2012 : greater impetus is given to production in the industrial sector (carpentry and electronics), where flexibility in finding customized solutions for weighing and the ability to work with the industry is a real added value to the market.