... Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Diameter ... of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: ... Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ ...