... stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: Diameter of 28.5mm(1.12 ... ), nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ 350nm spectral response, using a ... meter, optical properties to identify,replicate equipment. General data: Spectral Response Range300~680nmWavelength of Maximum Response 420nmMinimum ...