O/a dim. 12.063 in. Lg, 8.813 in.W; wt 9 lb; w/power supply; w/plexiglass window; magnetic, electrostatic and radio frequency interference shielding; designed to accept a 2.1 in. Diameter max end photomultiplier; cooled w/water or a mixture of alcohol and water; liquid enters and exits through seamless stainless steel tubing; power rqmt: 85 watts at 115 v or 220 v, 50 to 60 hz