Before revision: As of 2012 , the Vactrol ROs were produced by PerkinElmer , the successor Vactec .
After revision: As of 2010 , the Vactrol ROs were produced by Perkin Elmer , the successor of Vactec until its illumination and detection solutions businesses were divestituted as an independent company Excelitas Technologies in november 2010.Excelitas ended the production of ROs in december 2015.As of 2021 Vactrol type RO's are still manufactured by Advanced Photonix and at least two factories in China .