1937 - founded by Richard S Perkin and Charles W Elmer as an optics design and consultancy; 1939 - incorporated as a company (in New York); 1944 - manufactured a spectrophotometer (available commercially for first time) 1949 - commercial flame photometer introduced; 1951 - infrared spectorphotometer introduced; 1954 - Tiselius electrophoresis instrument introduced; 1955 - vapour fractometer introduced as first commercially available gas chromatograph; ...

2010 - HQ, 940 Winter Street, Waltham, Massachusetts 02451, United States, producing optoelectronics, precision instruments, software and services for scientific and industrial laboratory applications.