- Detector: Halogen-quenched Geiger-Müller tube. Effective diameter 1.75″ (45 mm). Mica window density 1.5-2.0 mg/cm².
- Display: 4-digit liquid crystal display with mode indicators
- Operating Range:
+ mR/hr: .001 to 100.0
+ CPM: 0 to 350,000
+ Total: 1 to 9,999,000 counts
+ µSv/hr: .01 to 1,000
+ CPS: 0 to 5,000
- Gamma Sensitivity: 3500 CPM/mR/hr referenced to Cs-137 ; Smallest detectable level for I-125 is .02 µCi at contact
- Efficiency: For 4 pi geometry at contact
- Beta :
+ C-14 (49 keV avg. 156 keV max.): 5.3%
+ Bi-210 (390 keV avg. 1.2 MeV max.): 32%
+ Sr-90 (546 keV and 2.3 MeV): 38%
+ P-32 (693 keV avg. 1.7 MeV max.): 33%
- Alpha : Am-241 (5.5 MeV): 18%
- Averaging 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. User can select a fast 3-second averaging period.
- Timer: Can set 1-10 minute sampling periods in one-minute increments, 10-50 minute sampling periods in 10-minute increments, and 1-24 hour sampling periods in 1-hour increments
- Alert: Beeper sounds the alert ; User-adjustable alert level is set using three buttons
- Accuracy: ± 15% up to 50 mR/hr; ± 20% up to 100 mR/hr
- Anti-Saturation: Readout holds at full scale in fields up to 100 times the maximum reading
- Temperature Range: -20º to +50º C , -4º to +122º F
- Power: One 9-volt alkaline battery; battery life is average 2160 hours at normal background, average 625 hours at 1 mR/hr with beeper off
- Size: 150 x 80 x 30 mm (5.9″ x 3.2″ x 1.2″)
- Weight: 323 grams (11.4 oz) including battery
- I/O Ports: Dual miniature jack for CMOS or TTL devices, sending counts to computer or data logger. Submini jack for electronic calibration.
- Count Light: Red LED flashes with each radiation event
- Audio: Beeper beeps with each radiation event; can be muted