Eberline ERM2 is a portable 120VAC powered monitor that can be used for emergency response.  It comes in a very robust steel carry case with o-ring seal.

It utilized an Eberline SRM-100 meter and a HP-270 energy compensated GM with associated power conditioning features for stability.  Great as a permanent monitor, or can be parted out to get the meter and probe inside.  Very rugged case.