Magnetic Shield Model 218

Magnetic shields are recommended for use with photomultiplier tubes to reduce the interference from either the earth's magnetic field or from stray magnetic fields from other equipment. The model 218 is for use with 2 inch diameter photomultiplier tubes and the ORTEC model 265 Tube Base. The model 218 is nominally 12.7 cm (5 in) long and 7.6 cm (3 in) maximum outside diameter.