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Detector: Internal halogen-quenched, uncompensated GM tube with thin mica window, 1.4 – 2.0 mg/cm² areal density; Effective window diameter: 45 mm (1.77 in.)
Operating Range:
mR/hr: 0.001 (1 µR) to 100
CPM: 0 to 350,000
µSv/hr: 0.01 to 1000
CPS: 0 to 5000
Total / Timer: 1 to 9,999,000 counts
Energy Sensitivity: 3340 CPM/mR/hr (referenced to Cs137)
Detects Alpha down to 2 MeV
Detects Beta down to 0.16 MeV; typical efficiency at 1 MeV ~25%
Detects Gamma down to 10 keV through the window
Minimum detectable level for I125: 0.02 µCi (at contact)
Accuracy: (Referenced to Cs137) ±15% (factory); ±10% with NIST source calibration
Anti-Saturation: Meter holds at full scale in radiation fields up to 100 times the maximum reading
Averaging Periods:
Display updates every 3 seconds
At low background levels: moving average over 30 seconds
Averaging period decreases as radiation level increases
Display & Alarm
Display: Graphic LCD with backlight
Count Light: Red LED flashes with each radiation event
Alert Set Range: mR/hr: 0.001 – 100; CPM: 1 – 350,000
Alarm: Internal beeper, 70 dB at 1 m (can be muted)
Outputs: Bluetooth (optional) BLE; USB for use with Observer software
Power Supply: 2 × AA batteries
Size: 140 × 68 × 33 mm
