... 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: Diameter ... 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ 350nm ... counter, biochemical analyzer, X-ray camera timer, optical density meter, optical properties to identify,replicate equipment. General data: Spectral ...