Specifications Detector Halogen-quenched GM tube with mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick. Display 4-digit liquid crystal display with mode indicators. Display updates every 60 sec. Count Light Red LED flashes with each count. Audio Indicator Sounds with each count (can be switched off for silent operation). Alert Pulsating beeper sounds the alert. Three separate adjustable alert levels are used for mR/hr, CPM, µSv/hr:, and Total. Outputs Dual miniature jack sends counts to CMOS- compatible devices, including computers, data loggers, and educational data collection systems. Submini jack provides audio output to an external earpiece, amplifier, or tape recorder. Operating Range mR/hr - .001 (1µR) to 100 mR/hr µSv/hr - .01 to 1000 CPM - 0 to 350,000 CPS - 0 to 5000 Total/ Timer - 1 to 9,999,000 counts Gamma Sensitivity 1000 CPM/mR/hr referenced to Cs-1 37. Accuracy ±10% typical (NIST), Typically ±15% of reading. Energy Sensitivity • Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. • Detects beta at 50 keV with typical 35% detection efficiency. • Detects beta at 150 keV with typical 75% detection efficiency. • Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case. Normal background is 5-20 CPM. Anti-Saturation Readout will hold at full scale in high radiation fields as high as 100 times the maximum reading. Power One 9-volt alkaline battery. Battery Life Battery life is typically 2000 hours at normal background radiation levels. Temperature Range -10° to +50°C (14° to 122° F) Weight 117 grams (6.5 oz.) without battery. Size 150 x 80 x 30 mm (5.9 x 3.3 x 1.2 in.).