... borosilicate glass, double-alkali photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, ... glass, double-alkali photocathode Features: Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, ... structure, with excellent output stability. Applicable technology areas: Spectrophotometer, colorimeter, dust meter, light meter, radiation calorimeter,scanning ...