Radiation Survey Meter Geiger Counter Operating Range .001 (1micronR) to 1000 mR/hr .01 to 10000 micronSv/hr 0 to 450 000 CPM 0 to 7500 CPS Total Counts-1 to 9 999 000 counts Gamma Radiation Range Detects Gamma and X-Rays down to 40 keV Energy Sensitivity 450 CPM/mR/hr (referenced to Cs137) Response is flat from 40 keV up Gamma and X-ray Energy Sensitivity Energy Sensitivity 450 CPM/mR/hr referenced to Cs137