Detector : Halogen-quenched Geiger-Mueller tube Effective diameter 1.75"(45 mm) Mica window density 1.5-2.0 mg/cm'   Detects Alpha, Beta, Gamma and X-radiation Display : 4-digit liquid crystal display with mode indicators Operating Range : µSv/hr:      .01 - 1,100         mR/hr:      .001 - 110   CPM:         0-350,000   CPS:         0 - 5,000   Total:        1 - 9,999,000 counts Calibration: Cesium-137 (gamma) Gamma Sensitivity:     Efficiency: Isotope C-14 (Beta) Bi-210 (Beta) Sr-90 (Beta) P-32   (Beta) Am-241 (Alpha) 3500 CPM/mR/hr referenced to Cs-137 Smallest detectable level for 1-125 is .02 mCi at contact For 4 pi at contact : Energy                                     Efficiency 49 keV avg.   156 keV max.        5.3% 390 keV avg. 1.2MeV   max.      32% 546 keV and 2.3   MeV               38% 693 keV avg. 1.7 MeV   max.      33% MeV         18% Accuracy : ±10% typical;±15% maximum Alert Range : µSv/hr:     O to 500 mR/hr:                 O to SO CPM:         O to 160,000 Beeper sounds the alert   Timer : Can set sampling periods of 1 minute to 40 hours   Averag i ng Periods: Display updates every 3 seconds, showing the average for the past 30-second time period at normal levels The averaging period decreases as the radiation level increases     Count Light : Red LED flashes with each count   Audio : Beeper chirps for each count (can be muted)   Ports : Output: Stereo 3.5mm jack sends counts to computers, data loggers, other CMOS-compatible devices, earphones, and educational data collection systems. 0-9 V, 1 kOhm impedance. Input: 2.5 mm monojack provides calibration input. 0-3.3 V,> Sµs width, rising edge triggered   Anti-Saturation : Readout holds at full scale in fields up to 100 times the maximum reading   Temperature Range : -20° to +50° c,-4° to +122