| 1985 | Delta Instruments founded by Sietze Sietzema |
| 1989 | First company to introduce flow cytometer (FC) for counting somatic cells in milk |
| SomaScope CAII introduced |
| 1990 | CombiScope Filter model 90 introduced |
| 1991 | LactoScope IR Filter manual introduced |
| 1992 | FT-IR analyzer manual |
| 1997 | SomaScope MKII Manual & Auto 200/400 introduced |
| 1998 | CombiScope Filter 200/400 introduced |
| 1999 | LactoScope FTIR introduced |
| 2000 | CombiScope FTIR introduced |
| 2003 | Delta Instruments acquired by Advanced Instruments Inc. |
| 2006 | LactoScope FTIR Advanced introduced |
| 2008 | SomaScope Smart introduced |
