... nine stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: Diameter of 28 ... nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ 350nm spectral response ... : Spectrophotometer, colorimeter, dust meter, light meter, radiation calorimeter,scanning electron microscopy, turbidity meter, particle counter, biochemical analyzer ...