... photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double- ... : Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali ... stability. Applicable technology areas: Spectrophotometer, colorimeter, dust meter, light meter, radiation calorimeter,scanning electron microscopy, turbidity meter, particle ...