... 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: ... of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ ... light meter, radiation calorimeter,scanning electron microscopy, turbidity meter, particle counter, biochemical analyzer, X-ray camera timer, optical density meter ...