| 1946 |
The first SIGRIST photometer, a turbidity measurement instrument designed for continuous monitoring of beer filtration, was developed, built and sold by Dr. Ing. Willy Sigrist (March 21, 1907 – August 1, 1988). |
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| 1949 |
Founding of the Dr. Ing. W. Sigrist Measuring Instruments Company, Ennetbürgen. Serial production of photometers was launched. |
| 1951 |
The first absorption measuring instrument was sold. |
| 1956 |
The sales company Sigrist-Photometer AG was founded. |
| 1968 |
The first dust monitor and the first fluorescencemeter were sold. |
| 1968 |
The subsidiary Sigrist-Photometer GmbH for sales and customer services in southern Germany was founded. |
| 1976 |
The Dr. Ing. W. Sigrist Measuring Instruments Company, Ennetbürgen, was transferred into a public corporation: Dr. Sigrist AG, Ennetbürgen. |
| 1978 |
All shares of Dr. Sigrist AG and Sigrist-Photometer AG went from Dr. W. Sigrist over to Vereinigung Bizun (Bizun Association). |
| 1980 |
Launch of a compact instrument series. |
| 1996 |
Launch of the instrument C series. |
| 1996 |
Certification of the quality management system in compliance with EN ISO 9001. |
| 1998 |
Launch of the special purpose instrument series: the entire product portfolio was renewed between 1998 and 2005. |
| 2002 |
Certification of the quality management system in compliance with EN ISO 9001:2000. |
