GSM-500
Auto-Ranging Survey Meter

DSM-500
Digital Radiation Survey Meter

GSM-501
Analog Micro-R Survey Meter

DSM-501
Digital Micro-R Meter

DSM-502
Digital Radiation Survey Meter w/internal detector

DSM-503
Digital Radiation Survey Meter w/internal detector

DSM-504
Digital Radiation Survey Meter w/internal detector

GSM-506
Analog Survey Meter Internal/External Detectors

DSM-506
Digital Radiation Survey Meter w/internal & external detectors

GSM-525
Analog Survey Meter w/dual detectors